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//var/www/50mmla/phpMyAdmin/libraries/server_synchronize.lib.php

<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */

/**
* PMA_getMatchingTables places matching tables in source
* and target databases in $matching_tables array whereas
* $uncommon_source_tables array gets the tables present in
* source database but are absent from target database.
* Criterion for matching tables is just comparing their names.
*
* @param    $trg_tables   array of target database table names,
* @param    $src_tables   array of source database table names,
*
* @param    &$matching_tables           empty array passed by reference to save names of matching tables,
* @param    &$uncommon_source_tables    empty array passed by reference to save names of tables present in
*                                       source database but absent from target database
*/

/**
* PMA_getNonMatchingTargetTables() places tables present
* in target database but are absent from source database
*
* @param    $trg_tables   array of target database table names,
*
* @param    $matching_tables           $matching tables array containing names of matching tables,
* @param    &$uncommon_target_tables    empty array passed by reference to save names of tables presnet in
*                                       target database but absent from source database
*/

/**
 * PMA_dataDiffInTables() finds the difference in source and target matching tables by
 * first comparing source table's primary key entries with target table enteries.
 * It gets the field names for the matching table also for comparisons.
 * If the entry is found in target table also then it is checked for the remaining
 * field values also, in order to check whether update is required or not.
 * If update is required, it is placed in $update_array
 * Otherwise that entry is placed in the $insert_array.
 *
 * @uses     PMA_DBI_get_fields()
 * @uses     PMA_DBI_get_column_values()
 * @uses     PMA_DBI_fetch_result()
 *
 * @param    $src_db    name of source database
 * @param    $trg_db    name of target database
 * @param    $src_link  connection established with source server
 * @param    $trg_link  connection established with target server
 * @param    $index     Index of a table from $matching_table array
 *
 * @param    $update_array    A three dimensional array passed by reference to
 *                            contain updates required for each matching table
 * @param    $insert_array    A three dimensional array passed by reference to
 *                            contain inserts required for each matching table
 * @param    $fields_num      A two dimensional array passed by reference to
 *                            contain number of fields for each matching table
 * @param    $matching_table   array containing matching table names
 *
 * @param    $matching_tables_fields    A two dimensional array passed by reference to contain names of fields for each matching table
 *
 * @param    $matching_tables_keys     A two dimensional array passed by reference to contain names of keys for each matching table
 */
function PMA_dataDiffInTables($src_db, $trg_db, $src_link, $trg_link, &$matching_table, &$matching_tables_fields,
    &$update_array, &$insert_array, &$delete_array, &$fields_num, $matching_table_index, &$matching_tables_keys)
{
    if (isset($matching_table[$matching_table_index])) {
        $fld = array();
        $fld_results = PMA_DBI_get_fields($src_db, $matching_table[$matching_table_index], $src_link);
        $is_key = array();
        if (isset($fld_results)) {
            foreach ($fld_results as $each_field) {
                $field_name = $each_field['Field'];
                if ($each_field['Key'] == 'PRI') {
                    $is_key[] = $field_name;
                }
                $fld[] = $field_name;
            }
        }
        $matching_tables_fields[$matching_table_index] = $fld;
        $fields_num[$matching_table_index] = sizeof($fld);
        $matching_tables_keys[$matching_table_index] = $is_key;

$source_result_set = PMA_DBI_get_column_values($src_db, $matching_table[$matching_table_index], $is_key, $src_link);
        $source_size = sizeof($source_result_set);

$trg_fld_results = PMA_DBI_get_fields($trg_db, $matching_table[$matching_table_index], $trg_link);
        $all_keys_match = true;
        $trg_keys = array();

if (isset($trg_fld_results)) {
            foreach ($trg_fld_results as $each_field) {
                if ($each_field['Key'] == 'PRI') {
                    $trg_keys[] = $each_field['Field'];
                    if (! (in_array($each_field['Field'], $is_key))) {
                        $all_keys_match = false;
                    }
                }
            }
        }
        $update_row = 0;
        $insert_row = 0;
        $update_field = 0;
        $insert_field = 0;
        $starting_index = 0;

for ($j = 0; $j < $source_size; $j++) {
 $starting_index = 0;
			$update_field = 0;

if (isset($source_result_set[$j]) && ($all_keys_match)) {

// Query the target server to see which rows already exist
                $trg_select_query = "SELECT * FROM " . PMA_backquote($trg_db) . "."
        	        . PMA_backquote($matching_table[$matching_table_index]) . " WHERE ";

if (sizeof($is_key) == 1) {
 $trg_select_query .= PMA_backquote($is_key[0]). "='" . $source_result_set[$j] . "'";
 } elseif (sizeof($is_key) > 1){
 for ($k=0; $k < sizeof($is_key); $k++) {
 $trg_select_query .= PMA_backquote($is_key[$k]) . "='" . $source_result_set[$j][$is_key[$k]] . "'";
 if ($k < (sizeof($is_key)-1)){
 $trg_select_query .= " AND ";
 }
 }
 }

$target_result_set = PMA_DBI_fetch_result($trg_select_query, null, null, $trg_link);
				if ($target_result_set) {

// Fetch the row from the source server to do a comparison
                    $src_select_query = "SELECT * FROM " . PMA_backquote($src_db) . "."
                 	   . PMA_backquote($matching_table[$matching_table_index]) . " WHERE ";

if (sizeof($is_key) == 1) {
 $src_select_query .= PMA_backquote($is_key[0]) . "='" . $source_result_set[$j] . "'";
 } else if(sizeof($is_key) > 1){
 for ($k=0; $k< sizeof($is_key); $k++) {
 $src_select_query .= PMA_backquote($is_key[$k]) . "='" . $source_result_set[$j][$is_key[$k]] . "'";
 if ($k < (sizeof($is_key) - 1)){
 $src_select_query .= " AND ";
 }
 }
 }

$src_result_set = PMA_DBI_fetch_result($src_select_query, null, null, $src_link);

/**
 * Comparing each corresponding field of the source and target matching rows.
 * Placing the primary key, value of primary key, field to be updated, and the
 * new value of field to be updated in each row of the update array.
 */
 for ($m = 0; ($m < $fields_num[$matching_table_index]) && ($starting_index == 0) ; $m++) {
 if (isset($src_result_set[0][$fld[$m]])) {
 if (isset($target_result_set[0][$fld[$m]])) {
 if (($src_result_set[0][$fld[$m]] != $target_result_set[0][$fld[$m]]) && (! (in_array($fld[$m], $is_key)))) {
 if (sizeof($is_key) == 1) {
 if ($source_result_set[$j]) {
 $update_array[$matching_table_index][$update_row][$is_key[0]] = $source_result_set[$j];
 }
 } elseif (sizeof($is_key) > 1) {
 for ($n=0; $n < sizeof($is_key); $n++) {
 if (isset($src_result_set[0][$is_key[$n]])) {
 $update_array[$matching_table_index][$update_row][$is_key[$n]] = $src_result_set[0][$is_key[$n]];
 }
 }
 }

$update_array[$matching_table_index][$update_row][$update_field] = $fld[$m];

$update_field++;
                                if (isset($src_result_set[0][$fld[$m]])) {
                                    $update_array[$matching_table_index][$update_row][$update_field] = $src_result_set[0][$fld[$m]];
                                    $update_field++;
                                }
                                $starting_index = $m;
                                $update_row++;
                            }
                        } else {
                               if (sizeof($is_key) == 1) {
                                    if ($source_result_set[$j]) {
                                        $update_array[$matching_table_index][$update_row][$is_key[0]] = $source_result_set[$j];

}
 } elseif (sizeof($is_key) > 1) {
 for ($n = 0; $n < sizeof($is_key); $n++) {
 if (isset($src_result_set[0][$is_key[$n]])) {
 $update_array[$matching_table_index][$update_row][$is_key[$n]] = $src_result_set[0][$is_key[$n]];
 }
 }
 }

$update_array[$matching_table_index][$update_row][$update_field] = $fld[$m];

$update_field++;
 if (isset($src_result_set[0][$fld[$m]])) {
 $update_array[$matching_table_index][$update_row][$update_field] = $src_result_set[0][$fld[$m]];
 $update_field++;
 }
 $starting_index = $m;
 $update_row++;
 }
 }
 }
 for ($m = $starting_index + 1; $m < $fields_num[$matching_table_index] ; $m++)
 {
 if (isset($src_result_set[0][$fld[$m]])) {
 if (isset($target_result_set[0][$fld[$m]])) {
 if (($src_result_set[0][$fld[$m]] != $target_result_set[0][$fld[$m]]) && (!(in_array($fld[$m], $is_key)))) {
 $update_row--;
 $update_array[$matching_table_index][$update_row][$update_field] = $fld[$m];
 $update_field++;
 if ($src_result_set[0][$fld[$m]]) {
 $update_array[$matching_table_index][$update_row][$update_field] = $src_result_set[0][$fld[$m]];
 $update_field++;
 }
 $update_row++;
 }
 } else {
 $update_row--;
 $update_array[$matching_table_index][$update_row][$update_field] = $fld[$m];
 $update_field++;
 if ($src_result_set[0][$fld[$m]]) {
 $update_array[$matching_table_index][$update_row][$update_field] = $src_result_set[0][$fld[$m]];
 $update_field++;
 }
 $update_row++;
 }
 }
 }
				} else {
					/**
					 * Placing the primary key, and the value of primary key of the row that is to be inserted in the target table
					 */
 if (sizeof($is_key) == 1) {
 if (isset($source_result_set[$j])) {
 $insert_array[$matching_table_index][$insert_row][$is_key[0]] = $source_result_set[$j];
 }
 } elseif (sizeof($is_key) > 1) {
 for($l = 0; $l < sizeof($is_key); $l++) {
 if (isset($source_result_set[$j][$matching_tables_fields[$matching_table_index][$l]])) {
 $insert_array[$matching_table_index][$insert_row][$is_key[$l]] = $source_result_set[$j][$matching_tables_fields[$matching_table_index][$l]];
 }
 }
 }
 $insert_row++;
 }
 } else {
 /**
 * Placing the primary key, and the value of primary key of the row that is to be inserted in the target table
 * This condition is met when there is an additional column in the source table
 */
 if (sizeof($is_key) == 1) {
 if (isset($source_result_set[$j])) {
 $insert_array[$matching_table_index][$insert_row][$is_key[0]] = $source_result_set[$j];
 }
 } elseif (sizeof($is_key) > 1) {
 for ($l = 0; $l < sizeof($is_key); $l++) {
 if (isset($source_result_set[$j][$matching_tables_fields[$matching_table_index][$l]])) {
 $insert_array[$matching_table_index][$insert_row][$is_key[$l]] = $source_result_set[$j][$matching_tables_fields[$matching_table_index][$l]];
 }
 }
 }
 $insert_row++;
 }
 } // for loop ends
 }
}
/**
* PMA_findDeleteRowsFromTargetTables finds the rows which are to be deleted from target table.
* @uses sizeof()
* @uses PMA_DBI_get_column_values()
* @uses in_array()
*
* @param $delete_array array containing rows that are to be deleted
* @param $matching_table array containing matching table names
* @param $matching_table_index index of a table from $matching_table array
* @param $trg_keys array of target table keys
* @param $src_keys array of source table keys
* @param $trg_db name of target database
* @param $trg_link connection established with target server
* @param $src_db name of source database
* @param $src_link connection established with source server
*
*/
function PMA_findDeleteRowsFromTargetTables(&$delete_array, $matching_table, $matching_table_index, $trg_keys, $src_keys, $trg_db, $trg_link,$src_db, $src_link)
{
 if (isset($trg_keys[$matching_table_index])) {
 $target_key_values = PMA_DBI_get_column_values($trg_db, $matching_table[$matching_table_index], $trg_keys[$matching_table_index], $trg_link);
 $target_row_size = sizeof($target_key_values);
 }
 if (isset($src_keys[$matching_table_index])) {
 $source_key_values = PMA_DBI_get_column_values($src_db, $matching_table[$matching_table_index], $src_keys[$matching_table_index], $src_link);
 $source_size = sizeof($source_key_values);
 }
 $all_keys_match = 1;
 for ($a = 0; $a < sizeof($trg_keys[$matching_table_index]); $a++) {
 if (isset($trg_keys[$matching_table_index][$a])) {
 if (! (in_array($trg_keys[$matching_table_index][$a], $src_keys[$matching_table_index]))) {
 $all_keys_match = 0;
 }
 }
 }
 if (! ($all_keys_match)) {
 if (isset($target_key_values)) {
 $delete_array[$matching_table_index] = $target_key_values;
 }
 }
 if (isset($trg_keys[$matching_table_index])) {
 if ((sizeof($trg_keys[$matching_table_index]) == 1) && $all_keys_match) {
 $row = 0;
 if (isset($target_key_values)) {
 for ($i = 0; $i < sizeof($target_key_values); $i++) {
 if (! (in_array($target_key_values[$i], $source_key_values))) {
 $delete_array[$matching_table_index][$row] = $target_key_values[$i];
 $row++;
 }
 }
 }
 } elseif ((sizeof($trg_keys[$matching_table_index]) > 1) && $all_keys_match) {
 $row = 0;
 if (isset($target_key_values)) {
 for ($i = 0; $i < sizeof($target_key_values); $i++) {
 $is_present = false;
 for ($j = 0; $j < sizeof($source_key_values) && ($is_present == false) ; $j++) {
 $check = true;
 for ($k = 0; $k < sizeof($trg_keys[$matching_table_index]); $k++) {
 if ($target_key_values[$i][$trg_keys[$matching_table_index][$k]] != $source_key_values[$j][$trg_keys[$matching_table_index][$k]]) {
 $check = false;
 }
 }
 if ($check) {
 $is_present = true;
 }
 }
 if (! ($is_present)) {
 for ($l = 0; $l < sizeof($trg_keys[$matching_table_index]); $l++) {
 $delete_array[$matching_table_index][$row][$trg_keys[$matching_table_index][$l]] = $target_key_values[$i][$trg_keys[$matching_table_index][$l]];
 }
 $row++;
 }
 }
 }
 }
 }
}

/**
* PMA_dataDiffInUncommonTables() finds the data difference in  $source_tables_uncommon
* @uses   PMA_DBI_fetch_result()
*
* @param  $source_tables_uncommon  array of table names; containing table names that are in source db and not in target db
* @param  $src_db                  name of source database
* @param  $src_link                connection established with source server
* @param  $index                   index of a table from $matching_table array
* @param  $row_count               number of rows
*/

function PMA_dataDiffInUncommonTables($source_tables_uncommon, $src_db, $src_link, $index, &$row_count)
{
   $query = "SELECT COUNT(*) FROM " . PMA_backquote($src_db) . "." . PMA_backquote($source_tables_uncommon[$index]);
   $rows  = PMA_DBI_fetch_result($query, null, null, $src_link);
   $row_count[$index] = $rows[0];
}

/**
* PMA_updateTargetTables() sets the updated field values to target table rows using $update_array[$matching_table_index]
*
* @uses    PMA_DBI_fetch_result()
* @uses    PMA_backquote()
*
* @param    $table                 Array containing matching tables' names
* @param    $update_array          A three dimensional array containing field
*                                  value updates required for each matching table
* @param    $src_db                Name of source database
* @param    $trg_db                Name of target database
* @param    $trg_link              Connection established with target server
* @param    $matching_table_index  index of matching table in matching_table_array
* @param    $display               true/false value
*/

function PMA_updateTargetTables($table, $update_array, $src_db, $trg_db, $trg_link, $matching_table_index, $matching_table_keys, $display)
{
    if (isset($update_array[$matching_table_index])) {
        if (sizeof($update_array[$matching_table_index])) {

for ($update_row = 0; $update_row < sizeof($update_array[$matching_table_index]); $update_row++) {

if (isset($update_array[$matching_table_index][$update_row])) {
                     $update_fields_num = sizeof($update_array[$matching_table_index][$update_row])-sizeof($matching_table_keys[$matching_table_index]);
                     if ($update_fields_num > 0) {
                        $query = "UPDATE " . PMA_backquote($trg_db) . "." .PMA_backquote($table[$matching_table_index]) . " SET ";

for ($update_field = 0; $update_field < $update_fields_num; $update_field = $update_field+2) {
 if (isset($update_array[$matching_table_index][$update_row][$update_field]) && isset($update_array[$matching_table_index][$update_row][$update_field+1])) {
 $query .= PMA_backquote($update_array[$matching_table_index][$update_row][$update_field]) . "='" . $update_array[$matching_table_index][$update_row][$update_field+1] . "'";
 }
 if ($update_field < ($update_fields_num - 2)) {
 $query .= ", ";
 }
 }
 $query .= " WHERE ";
 if (isset($matching_table_keys[$matching_table_index])) {
 for ($key = 0; $key < sizeof($matching_table_keys[$matching_table_index]); $key++)
 {
 if (isset($matching_table_keys[$matching_table_index][$key])) {

$query .= PMA_backquote($matching_table_keys[$matching_table_index][$key]) . "='" . $update_array[$matching_table_index][$update_row][$matching_table_keys[$matching_table_index][$key]] . "'";
 }
 if ($key < (sizeof($matching_table_keys[$matching_table_index]) - 1)) {
 $query .= " AND ";
 }
 }
 }
 if ($display == true) {
 echo "" . $query . "";
 }
 PMA_DBI_try_query($query, $trg_link, 0);
 }
 }
 }
 }
 }
}
/**
* PMA_insertIntoTargetTable() inserts missing rows in the target table using $array_insert[$matching_table_index]
*
* @uses PMA_DBI_fetch_result()
* @uses PMA_backquote()
*
*
* @param $matching_table array containing matching table names
* @param $src_db name of source database
* @param $trg_db name of target database
* @param $src_link connection established with source server
* @param $trg_link connection established with target server
* @param $table_fields array containing field names of a table
* @param $array_insert
* @param $matching_table_index index of matching table in matching_table_array
* @param $matching_tables_keys array containing field names that are keys in the matching table
* @param $source_columns array containing source column information
* @param $add_column_array array containing column names that are to be added in target table
* @param $criteria array containing criterias like type, null, collation, default etc
* @param $target_tables_keys array containing field names that are keys in the target table
* @param $uncommon_tables array containing table names that are present in source db but not in targt db
* @param $uncommon_tables_fields array containing field names of the uncommon tables
* @param $uncommon_cols column names that are present in target table and not in source table
* @param $alter_str_array array containing column names that are to be altered
* @param $source_indexes column names on which indexes are made in source table
* @param $target_indexes column names on which indexes are made in target table
* @param $add_indexes_array array containing column names on which index is to be added in target table
* @param $alter_indexes_array array containing column names whose indexes are to be altered. Only index name and uniqueness of an index can be changed
* @param $delete_array array containing rows that are to be deleted
* @param $update_array array containing rows that are to be updated in target
* @param $display true/false value
*
*/
function PMA_insertIntoTargetTable($matching_table, $src_db, $trg_db, $src_link, $trg_link, $table_fields, &$array_insert, $matching_table_index,
 $matching_tables_keys, $source_columns, &$add_column_array, $criteria, $target_tables_keys, $uncommon_tables, &$uncommon_tables_fields,$uncommon_cols,
 &$alter_str_array,&$source_indexes, &$target_indexes, &$add_indexes_array, &$alter_indexes_array, &$delete_array, &$update_array, $display)
{
 if(isset($array_insert[$matching_table_index])) {
 if (sizeof($array_insert[$matching_table_index])) {
 for ($insert_row = 0; $insert_row< sizeof($array_insert[$matching_table_index]); $insert_row++) {
 if (isset($array_insert[$matching_table_index][$insert_row][$matching_tables_keys[$matching_table_index][0]])) {

$select_query = "SELECT * FROM " . PMA_backquote($src_db) . "." . PMA_backquote($matching_table[$matching_table_index]) . " WHERE ";
 for ($i = 0; $i < sizeof($matching_tables_keys[$matching_table_index]); $i++) {
 $select_query .= $matching_tables_keys[$matching_table_index][$i] . "='";
 $select_query .= $array_insert[$matching_table_index][$insert_row][$matching_tables_keys[$matching_table_index][$i]] . "'" ;

if ($i < (sizeof($matching_tables_keys[$matching_table_index]) - 1)) {
 $select_query.= " AND ";
 }
 }
 $select_query .= "; ";
 $result = PMA_DBI_fetch_result ($select_query, null, null, $src_link);
 $insert_query = "INSERT INTO " . PMA_backquote($trg_db) . "." . PMA_backquote($matching_table[$matching_table_index]) ." (";

for ($field_index = 0; $field_index < sizeof($table_fields[$matching_table_index]); $field_index++)
 {
 $insert_query .= PMA_backquote($table_fields[$matching_table_index][$field_index]);

$is_fk_query = "SELECT * FROM information_schema.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = '" . $trg_db ."'
 AND TABLE_NAME = '" . $matching_table[$matching_table_index]. "'AND COLUMN_NAME = '" .
 $table_fields[$matching_table_index][$field_index] . "' AND TABLE_NAME <> REFERENCED_TABLE_NAME;" ;

$is_fk_result = PMA_DBI_fetch_result($is_fk_query, null, null, $trg_link);
 if (sizeof($is_fk_result) > 0) {
 for ($j = 0; $j < sizeof($is_fk_result); $j++)
 {
 $table_index = array_keys($matching_table, $is_fk_result[$j]['REFERENCED_TABLE_NAME']);

if (isset($alter_str_array[$table_index[0]])) {
                                   PMA_alterTargetTableStructure($trg_db, $trg_link, $matching_tables, $source_columns, $alter_str_array, $matching_tables_fields,
                                    $criteria, $matching_tables_keys, $target_tables_keys, $table_index[0], $display);
                                    unset($alter_str_array[$table_index[0]]);
                                }
                                if (isset($uncommon_columns[$table_index[0]])) {
                                    PMA_removeColumnsFromTargetTable($trg_db, $trg_link, $matching_tables, $uncommon_columns, $table_index[0], $display);
                                    unset($uncommon_columns[$table_index[0]]);
                                }
                                if (isset($add_column_array[$table_index[0]])) {
                                    PMA_findDeleteRowsFromTargetTables($delete_array, $matching_tables, $table_index[0], $target_tables_keys, $matching_tables_keys,
                                    $trg_db, $trg_link, $src_db, $src_link);

if (isset($delete_array[$table_index[0]])) {
                                       PMA_deleteFromTargetTable($trg_db, $trg_link, $matching_tables, $table_index[0], $target_tables_keys, $delete_array, $display);
                                       unset($delete_array[$table_index[0]]);
                                    }
                                    PMA_addColumnsInTargetTable($src_db, $trg_db, $src_link, $trg_link, $matching_tables, $source_columns, $add_column_array,
                                    $matching_tables_fields, $criteria, $matching_tables_keys, $target_tables_keys, $uncommon_tables,$uncommon_tables_fields,
                                    $table_index[0], $uncommon_cols, $display);
                                    unset($add_column_array[$table_index[0]]);
                                }
                                if (isset($add_indexes_array[$table_index[0]]) || isset($remove_indexes_array[$table_index[0]])
                                    || isset($alter_indexes_array[$table_index[0]])) {
                                    PMA_applyIndexesDiff ($trg_db, $trg_link, $matching_tables, $source_indexes, $target_indexes, $add_indexes_array, $alter_indexes_array,
                                    $remove_indexes_array, $table_index[0], $display);

unset($add_indexes_array[$table_index[0]]);
 unset($alter_indexes_array[$table_index[0]]);
 unset($remove_indexes_array[$table_index[0]]);
 }
 if (isset($update_array[$table_index[0]])) {
 PMA_updateTargetTables($matching_tables, $update_array, $src_db, $trg_db, $trg_link, $table_index[0], $matching_table_keys,
 $display);
 unset($update_array[$table_index[0]]);
 }
 if (isset($array_insert[$table_index[0]])) {
 PMA_insertIntoTargetTable($matching_table, $src_db, $trg_db, $src_link, $trg_link, $table_fields, $array_insert,
 $table_index[0], $matching_tables_keys, $source_columns, $add_column_array, $criteria, $target_tables_keys, $uncommon_tables,
 $uncommon_tables_fields, $uncommon_cols, $alter_str_array, $source_indexes, $target_indexes, $add_indexes_array,
 $alter_indexes_array, $delete_array, $update_array, $display);
 unset($array_insert[$table_index[0]]);
 }
 }
 }
 if ($field_index < sizeof($table_fields[$matching_table_index])-1) {
 $insert_query .= ", ";
 }
 }
 $insert_query .= ") VALUES(";
 if (sizeof($table_fields[$matching_table_index]) == 1) {
 $insert_query .= "'" . PMA_sqlAddslashes($result[0]) . "'";
 } else {
 for ($field_index = 0; $field_index < sizeof($table_fields[$matching_table_index]); $field_index++) {
 if (isset($result[0][$table_fields[$matching_table_index][$field_index]])) {
 $insert_query .= "'" . PMA_sqlAddslashes($result[0][$table_fields[$matching_table_index][$field_index]]) . "'";
 } else {
 $insert_query .= "'NULL'";
 }
 if ($field_index < (sizeof($table_fields[$matching_table_index])) - 1) {
 $insert_query .= " ," ;
 }
 }
 }
 $insert_query .= ");";
 if ($display == true) {
 PMA_displayQuery($insert_query);
 }
 PMA_DBI_try_query($insert_query, $trg_link, 0);
 }
 }
 }
 }
}
/**
* PMA_createTargetTables() Create the missing table $uncommon_table in target database
*
* @uses PMA_DBI_get_fields()
* @uses PMA_backquote()
* @uses PMA_DBI_fetch_result()
*
* @param $src_db name of source database
* @param $trg_db name of target database
* @param $trg_link connection established with target server
* @param $src_link connection established with source server
* @param $uncommon_table name of table present in source but not in target
* @param $table_index index of table in matching_table_array
* @param $uncommon_tables_fields field names of the uncommon table
* @param $display true/false value
*/
function PMA_createTargetTables($src_db, $trg_db, $src_link, $trg_link, &$uncommon_tables, $table_index, &$uncommon_tables_fields, $display)
{
 if (isset($uncommon_tables[$table_index])) {
 $fields_result = PMA_DBI_get_fields($src_db, $uncommon_tables[$table_index], $src_link);
 $fields = array();
 foreach ($fields_result as $each_field) {
 $field_name = $each_field['Field'];
 $fields[] = $field_name;
 }
 $uncommon_tables_fields[$table_index] = $fields;

$Create_Query = PMA_DBI_fetch_value("SHOW CREATE TABLE " . PMA_backquote($src_db) . '.' . PMA_backquote($uncommon_tables[$table_index]), 0, 1, $src_link);

// Replace the src table name with a `dbname`.`tablename`
        $Create_Table_Query = preg_replace('/' . preg_quote(PMA_backquote($uncommon_tables[$table_index]), '/') . '/',
                                            PMA_backquote($trg_db) . '.' .PMA_backquote($uncommon_tables[$table_index]),
                                            $Create_Query,
                                            $limit = 1
        );

$is_fk_query = "SELECT * FROM information_schema.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = '" . $src_db . "'
 AND TABLE_NAME = '" . $uncommon_tables[$table_index] . "' AND TABLE_NAME <> REFERENCED_TABLE_NAME;" ;

$is_fk_result = PMA_DBI_fetch_result($is_fk_query, null, null, $src_link);
 if (sizeof($is_fk_result) > 0) {
 for ($j = 0; $j < sizeof($is_fk_result); $j++)
 {
 if (in_array($is_fk_result[$j]['REFERENCED_TABLE_NAME'], $uncommon_tables)) {
 $table_index = array_keys($uncommon_tables, $is_fk_result[$j]['REFERENCED_TABLE_NAME']);
 PMA_createTargetTables($src_db, $trg_db, $trg_link, $src_link, $uncommon_tables, $table_index[0], $uncommon_tables_fields, $display);
 unset($uncommon_tables[$table_index[0]]);
 }
 }
 }
 if ($display == true) {
 echo '' . $Create_Table_Query . '';
 }
 PMA_DBI_try_query($Create_Table_Query, $trg_link, 0);
 }
}
/**
* PMA_populateTargetTables() inserts data into uncommon tables after they have been created
* @uses PMA_DBI_fetch_result()
* @uses PMA_backquote()
* @uses sizeof()
* @uses PMA_DBI_try_query()
*
* @param $src_db name of source database
* @param $trg_db name of target database
* @param $src_link connection established with source server
* @param $trg_link connection established with target server
* @param $uncommon_tables array containing uncommon table names (table names that are present in source but not in target db)
* @param $table_index index of table in matching_table_array
* @param $uncommon_tables_fields field names of the uncommon table
* @param $display true/false value
*
* FIXME: This turns NULL values into '' (empty string)
*/
function PMA_populateTargetTables($src_db, $trg_db, $src_link, $trg_link, $uncommon_tables, $table_index, $uncommon_tables_fields, $display)
{
 $display = false; // todo: maybe display some of the queries if they are not too numerous
 $unbuffered_result = PMA_DBI_try_query('SELECT * FROM ' . PMA_backquote($src_db) . '.' . PMA_backquote($uncommon_tables[$table_index]), $src_link, PMA_DBI_QUERY_UNBUFFERED);
 if (false !== $unbuffered_result) {
 $insert_query = 'INSERT INTO ' . PMA_backquote($trg_db) . '.' .PMA_backquote($uncommon_tables[$table_index]) . ' VALUES';
 while ($one_row = PMA_DBI_fetch_row($unbuffered_result)) {
 $insert_query .= '(';
 $key_of_last_value = count($one_row) - 1;
 foreach($one_row as $key => $value) {
 $insert_query .= "'" . PMA_sqlAddslashes($value) . "'";
 if ($key < $key_of_last_value) {
 $insert_query .= ",";
 }
 }
 $insert_query .= '),';
 }
 $insert_query = substr($insert_query, 0, -1);
 $insert_query .= ';';
 if ($display == true) {
 PMA_displayQuery($insert_query);
 }
 PMA_DBI_try_query($insert_query, $trg_link, 0);
 }
}
/**
* PMA_deleteFromTargetTable() delete rows from target table
* @uses sizeof()
* @uses PMA_backquote()
* @uses PMA_DBI_try_query()
*
*
* @param $trg_db name of target database
* @param $trg_link connection established with target server
* @param $matching_tables array containing matching table names
* @param $table_index index of table in matching_table_array
* @param $target_table_keys primary key names of the target tables
* @param $delete array array containing the key values of rows that are to be deleted
* @param $display true/false value
*/
function PMA_deleteFromTargetTable($trg_db, $trg_link, $matching_tables, $table_index, $target_tables_keys, $delete_array, $display)
{
 for($i = 0; $i < sizeof($delete_array[$table_index]); $i++) {
 if (isset($target_tables_keys[$table_index])) {
 $delete_query = 'DELETE FROM ' . PMA_backquote($trg_db) . '.' .PMA_backquote($matching_tables[$table_index]) . ' WHERE ';
 for($y = 0; $y < sizeof($target_tables_keys[$table_index]); $y++) {

$delete_query .= PMA_backquote($target_tables_keys[$table_index][$y]) . " = '";

if (sizeof($target_tables_keys[$table_index]) == 1) {
 $delete_query .= $delete_array[$table_index][$i] . "'";
 } elseif (sizeof($target_tables_keys[$table_index]) > 1) {
 $delete_query .= $delete_array[$table_index][$i][$target_tables_keys[$table_index][$y]] . "'";
 }
 if ($y < (sizeof($target_tables_keys[$table_index]) - 1)) {
 $delete_query .= ' AND ';
 }
 $pk_query = "SELECT * FROM information_schema.KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA = '" . $trg_db . "'
 AND REFERENCED_TABLE_NAME = '" . $matching_tables[$table_index]."' AND REFERENCED_COLUMN_NAME = '"
 . $target_tables_keys[$table_index][$y] . "' AND TABLE_NAME <> REFERENCED_TABLE_NAME;";

$pk_query_result = PMA_DBI_fetch_result($pk_query, null, null, $trg_link);
                $result_size = sizeof($pk_query_result);

if ($result_size > 0) {
 for ($b = 0; $b < $result_size; $b++) {
 $drop_pk_query = "DELETE FROM " . PMA_backquote($pk_query_result[$b]['TABLE_SCHEMA']) . "." . PMA_backquote($pk_query_result[$b]['TABLE_NAME']) . " WHERE " . PMA_backquote($pk_query_result[$b]['COLUMN_NAME']) . " = " . $target_tables_keys[$table_index][$y] . ";";
 PMA_DBI_try_query($drop_pk_query, $trg_link, 0);
 }
 }
 }
 }
 if ($display == true) {
 echo '' . $delete_query . '';
 }
 PMA_DBI_try_query($delete_query, $trg_link, 0);
 }
}
/**
* PMA_structureDiffInTables() Gets all the column information for source and target table.
* Compare columns on their names.
* If column exists in target then compare Type, Null, Collation, Key, Default and Comment for that column.
* If column does not exist in target table then it is placed in $add_column_array.
* If column exists in target table but criteria is different then it is palced in $alter_str_array.
* If column does not exist in source table but is present in target table then it is placed in $uncommon_columns.
* Keys for all the source tables that have a corresponding target table are placed in $matching_tables_keys.
* Keys for all the target tables that have a corresponding source table are placed in $target_tables_keys.
*
* @uses PMA_DBI_get_columns_full()
* @uses sizeof()
*
* @param $src_db name of source database
* @param $trg_db name of target database
* @param $src_link connection established with source server
* @param $trg_link connection established with target server
* @param $matching_tables array containing names of matching tables
* @param $source_columns array containing columns information of the source tables
* @param $target_columns array containing columns information of the target tables
* @param $alter_str_array three dimensional associative array first index being the matching table index, second index being column name for which target
* column have some criteria different and third index containing the criteria which is different.
* @param $add_column_array two dimensional associative array, first index of the array contain the matching table number and second index contain the
* column name which is to be added in the target table
* @param $uncommon_columns array containing the columns that are present in the target table but not in the source table
* @param $criteria array containing the criterias which are to be checked for field that is present in source table and target table
* @param $target_tables_keys array containing the field names which is key in the target table
* @param $matching_table_index integer number of the matching table
*
*/
function PMA_structureDiffInTables($src_db, $trg_db, $src_link, $trg_link, $matching_tables, &$source_columns, &$target_columns, &$alter_str_array,
 &$add_column_array, &$uncommon_columns, $criteria, &$target_tables_keys, $matching_table_index)
{
 //Gets column information for source and target table
 $source_columns[$matching_table_index] = PMA_DBI_get_columns_full($src_db, $matching_tables[$matching_table_index], null, $src_link);
 $target_columns[$matching_table_index] = PMA_DBI_get_columns_full($trg_db, $matching_tables[$matching_table_index], null, $trg_link);
 foreach ($source_columns[$matching_table_index] as $column_name => $each_column) {
 if (isset($target_columns[$matching_table_index][$column_name]['Field'])) {
 //If column exists in target table then matches criterias like type, null, collation, key, default, comment of the column
 for ($i = 0; $i < sizeof($criteria); $i++) {
 if ($source_columns[$matching_table_index][$column_name][$criteria[$i]] != $target_columns[$matching_table_index][$column_name][$criteria[$i]]) {
 if (($criteria[$i] == 'Default') && ($source_columns[$matching_table_index][$column_name][$criteria[$i]] == '' )) {
 $alter_str_array[$matching_table_index][$column_name][$criteria[$i]] = 'None';
 } else {
 if (! (($criteria[$i] == 'Key') && (($source_columns[$matching_table_index][$column_name][$criteria[$i]] == 'MUL')
 || ($target_columns[$matching_table_index][$column_name][$criteria[$i]] == 'MUL')
 || ($source_columns[$matching_table_index][$column_name][$criteria[$i]] == 'UNI')
 || ($target_columns[$matching_table_index][$column_name][$criteria[$i]] == 'UNI')))) {
 $alter_str_array[$matching_table_index][$column_name][$criteria[$i]] = $source_columns[$matching_table_index][$column_name][$criteria[$i]];
 }
 }
 }
 }
 } else {
 $add_column_array[$matching_table_index][$column_name]= $column_name;
 }
 }
 //Finds column names that are present in target table but not in source table
 foreach ($target_columns[$matching_table_index] as $fld_name => $each_column) {
 if (! (isset($source_columns[$matching_table_index][$fld_name]['Field']))) {
 $fields_uncommon[] = $fld_name;
 }
 if ($target_columns[$matching_table_index][$fld_name]['Key'] == 'PRI') {
 $keys[] = $fld_name;
 }
 }
 if (isset($fields_uncommon)) {
 $uncommon_columns[$matching_table_index] = $fields_uncommon;
 }
 if (isset($keys)) {
 $target_tables_keys[$matching_table_index] = $keys;
 }
}
/**
* PMA_addColumnsInTargetTable() adds column that are present in source table but not in target table
* @uses sizeof()
* @uses in_array()
* @uses array_keys()
* @uses PMA_checkForeignKeys()
* @uses PMA_createTargetTables()
* @uses PMA_DBI_try_query()
* @uses PMA_DBI_fetch_result()
*
* @param $src_db name of source database
* @param $trg_db name of target database
* @param $src_link connection established with source server
* @param $trg_link connection established with target server
* @param $matching_tables array containing names of matching tables
* @param $source_columns array containing columns information of the source tables
* @param $add_column_array array containing the names of the column(field) that are to be added in the target
* @param $matching_tables_fields
* @param $criteria array containing the criterias
* @param $matching_tables_keys array containing the field names which is key in the source table
* @param $target_tables_keys array containing the field names which is key in the target table
* @param $uncommon_tables array containing the table names that are present in source db and not in target db
* @param $uncommon_tables_fields array containing the names of the fields of the uncommon tables
* @param $table_counter integer number of the matching table
* @param $uncommon_cols
* @param $display true/false value
*/
function PMA_addColumnsInTargetTable($src_db, $trg_db, $src_link, $trg_link, $matching_tables, $source_columns, &$add_column_array, $matching_tables_fields,
 $criteria, $matching_tables_keys, $target_tables_keys, $uncommon_tables, &$uncommon_tables_fields, $table_counter, $uncommon_cols, $display)
{
 for ($i = 0; $i < sizeof($matching_tables_fields[$table_counter]); $i++) {
 if (isset($add_column_array[$table_counter][$matching_tables_fields[$table_counter][$i]])) {
 $query = "ALTER TABLE " . PMA_backquote($trg_db) . '.' . PMA_backquote($matching_tables[$table_counter]). " ADD COLUMN " .
 PMA_backquote($add_column_array[$table_counter][$matching_tables_fields[$table_counter][$i]]) . " " . $source_columns[$table_counter][$matching_tables_fields[$table_counter][$i]]['Type'];

if($source_columns[$table_counter][$matching_tables_fields[$table_counter][$i]]['Null'] == 'NO') {
 $query .= ' Not Null ';
 } elseif ($source_columns[$table_counter][$matching_tables_fields[$table_counter][$i]]['Null'] == 'YES') {
 $query .= ' Null ';
 }
 if ($source_columns[$table_counter][$matching_tables_fields[$table_counter][$i]]['Collation'] != '') {
 $query .= ' COLLATE ' . $source_columns[$table_counter][$matching_tables_fields[$table_counter][$i]]['Collation'];
 }
 if ($source_columns[$table_counter][$matching_tables_fields[$table_counter][$i]]['Default'] != '') {
 $query .= " DEFAULT " . $source_columns[$table_counter][$matching_tables_fields[$table_counter][$i]]['Default'];
 }
 if ($source_columns[$table_counter][$matching_tables_fields[$table_counter][$i]]['Comment'] != '') {
 $query .= " COMMENT " . $source_columns[$table_counter][$matching_tables_fields[$table_counter][$i]]['Comment'];
 }
 if ($source_columns[$table_counter][$matching_tables_fields[$table_counter][$i]]['Key'] == 'PRI' ) {
 $trg_key_size = sizeof($target_tables_keys[$table_counter]);
 if ($trg_key_size) {
 $check = true;
 for ($a = 0; ($a < $trg_key_size) && ($check); $a++) {
 if (! (in_array($target_tables_keys[$table_counter], $uncommon_cols))) {
 $check = false;
 }
 }
 if (! $check) {
 $query .= " ,DROP PRIMARY KEY " ;
 }
 }
 $query .= " , ADD PRIMARY KEY (";
 for ($t = 0; $t < sizeof($matching_tables_keys[$table_counter]); $t++) {
 $query .= PMA_backquote($matching_tables_keys[$table_counter][$t]);
 if ($t < (sizeof($matching_tables_keys[$table_counter]) - 1)) {
 $query .= " , " ;
 }
 }
 $query .= ")";
 }

$query .= ";";
 if ($display == true) {
 echo '' . $query . '';
 }
 PMA_DBI_try_query($query, $trg_link, 0);

//Checks if column to be added is a foreign key or not
 $is_fk_query = "SELECT * FROM information_schema.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = '" . $trg_db . "' AND TABLE_NAME = '"
 . $matching_tables[$table_counter] . "' AND COLUMN_NAME ='" . $add_column_array[$table_counter][$matching_tables_fields[$table_counter][$i]] .
 "' AND TABLE_NAME <> REFERENCED_TABLE_NAME;";

$is_fk_result = PMA_DBI_fetch_result($is_fk_query, null, null, $src_link);

//If column is a foreign key then it is checked that referenced table exist in target db. If referenced table does not exist in target db then
            //it is created first.
            if (isset($is_fk_result)) {
                if (in_array($is_fk_result[0]['REFERENCED_TABLE_NAME'], $uncommon_tables)) {
                    $table_index = array_keys($uncommon_tables, $is_fk_result[0]['REFERENCED_TABLE_NAME']);
                    PMA_checkForeignKeys($src_db, $src_link, $trg_db, $trg_link, $is_fk_result[0]['REFERENCED_TABLE_NAME'], $uncommon_tables, $uncommon_tables_fields);
                    PMA_createTargetTables($src_db, $trg_db, $trg_link, $src_link, $uncommon_tables, $table_index[0], $uncommon_tables_fields);
                    unset($uncommon_tables[$table_index[0]]);
                }
                $fk_query = "ALTER TABLE " . PMA_backquote($trg_db) . '.' . PMA_backquote($matching_tables[$table_counter]) .
                            "ADD CONSTRAINT FOREIGN KEY " . PMA_backquote($add_column_array[$table_counter][$matching_tables_fields[$table_counter][$i]]) . "
                            (" . $add_column_array[$table_counter][$matching_tables_fields[$table_counter][$i]] . ") REFERENCES " . PMA_backquote($trg_db) .
                             '.' . PMA_backquote($is_fk_result[0]['REFERENCED_TABLE_NAME']) . " (" . $is_fk_result[0]['REFERENCED_COLUMN_NAME'] . ");";

PMA_DBI_try_query($fk_query, $trg_link, null);
 }
 }
 }
}
/**
* PMA_checkForeignKeys() checks if the referenced table have foreign keys.
* @uses sizeof()
* @uses in_array()
* @uses array_keys()
* @uses PMA_checkForeignKeys()
* uses PMA_createTargetTables()
*
* @param $src_db name of source database
* @param $src_link connection established with source server
* @param $trg_db name of target database
* @param $trg_link connection established with target server
* @param $referenced_table table whose column is a foreign key in another table
* @param $uncommon_tables array containing names that are uncommon
* @param $uncommon_tables_fields field names of the uncommon table
* @param $display true/false value
*/
function PMA_checkForeignKeys($src_db, $src_link, $trg_db, $trg_link ,$referenced_table, &$uncommon_tables, &$uncommon_tables_fields, $display)
{
 $is_fk_query = "SELECT * FROM information_schema.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = '" . $src_db . "'
 AND TABLE_NAME = '" . $referenced_table . "' AND TABLE_NAME <> REFERENCED_TABLE_NAME;";

//Checks if the criteria to be altered is primary key
 for ($v = 0; $v < sizeof($matching_tables_fields[$matching_table_index]); $v++) {
 if (isset($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$v]]['Key'])) {
 if ($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$v]]['Key'] == 'PRI' ) {
 $check = false;
 }
 }
 }
 $pri_query;
 if (! $check) {
 $pri_query = "ALTER TABLE " . PMA_backquote($trg_db) . '.' . PMA_backquote($matching_tables[$matching_table_index]);
 if (sizeof($target_tables_keys[$matching_table_index]) > 0) {
 $pri_query .= " DROP PRIMARY KEY ," ;
 }
 $pri_query .= " ADD PRIMARY KEY (";
 for ($z = 0; $z < sizeof($matching_tables_keys[$matching_table_index]); $z++) {
 $pri_query .= PMA_backquote($matching_tables_keys[$matching_table_index][$z]);
 if ($z < (sizeof($matching_tables_keys[$matching_table_index]) - 1)) {
 $pri_query .= " , " ;
 }
 }
 $pri_query .= ");";
 }

if (isset($pri_query)) {
 if ($display == true) {
 echo '' . $pri_query . '';
 }
 PMA_DBI_try_query($pri_query, $trg_link, 0);
 }
 for ($t = 0; $t < sizeof($matching_tables_fields[$matching_table_index]); $t++) {
 if ((isset($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]])) && (sizeof($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]]) > 0)) {
 $sql_query = 'ALTER TABLE ' . PMA_backquote($trg_db) . '.' . PMA_backquote($matching_tables[$matching_table_index]) . ' MODIFY ' .
 PMA_backquote($matching_tables_fields[$matching_table_index][$t]) . ' ' . $source_columns[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]]['Type'];
 $found = false;
 for ($i = 0; $i < sizeof($criteria); $i++)
 {
 if (isset($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]]) && $criteria[$i] != 'Key') {
 $found = true;
 if (($criteria[$i] == 'Type') && (! isset($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i+1]]))) {
 if ($source_columns[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i + 1]] == 'NO') {
 $sql_query .= " Not Null" ;
 } elseif ($source_columns[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i + 1]] == 'YES') {
 $sql_query .= " Null" ;
 }
 }
 if (($criteria[$i] == 'Null') && ( $alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]] == 'NO')) {
 $sql_query .= " Not Null " ;
 } elseif (($criteria[$i] == 'Null') && ($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]] == 'YES')) {
 $sql_query .= " Null " ;
 }
 if ($criteria[$i] == 'Collation') {
 if( !(isset($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[2]]))) {
 $sql_query .= " Not Null " ;
 }
 $sql_query .= " COLLATE " . $alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]] ;
 }
 if (($criteria[$i] == 'Default') && ($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]] == 'None')) {
 if( !(isset($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[2]]))) {
 $sql_query .= " Not Null " ;
 }
 } elseif($criteria[$i] == 'Default') {
 if(! (isset($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[2]]))) {
 $sql_query .= " Not Null " ;
 }
 if (is_string($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]])) {
 if ($source_columns[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]]['Type'] != 'timestamp') {
 $sql_query .= " DEFAULT '" . $alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]] . "'";
 } elseif($source_columns[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]]['Type'] == 'timestamp') {
 $sql_query .= " DEFAULT " . $alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]];
 }
 } elseif (is_numeric($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]])) {
 $sql_query .= " DEFAULT " . $alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]];
 }
 }
 if ($criteria[$i] == 'Comment') {
 if( !(isset($alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[2]]))) {
 $sql_query .= " Not Null " ;
 }
 $sql_query .= " COMMENT '" . $alter_str_array[$matching_table_index][$matching_tables_fields[$matching_table_index][$t]][$criteria[$i]] . "'" ;
 }
 }
 }
 }
 $sql_query .= ";";
 if ($found) {
 if ($display == true) {
 echo '' . $sql_query . '';
 }
 PMA_DBI_try_query($sql_query, $trg_link, 0);
 }
 }
 $check = false;
 $query = "ALTER TABLE " . PMA_backquote($trg_db) . '.' . PMA_backquote($matching_tables[$matching_table_index]);
 for($p = 0; $p < sizeof($matching_tables_keys[$matching_table_index]); $p++) {
 if ((isset($alter_str_array[$matching_table_index][$matching_tables_keys[$matching_table_index][$p]]['Key']))) {
 $check = true;
 $query .= ' MODIFY ' . PMA_backquote($matching_tables_keys[$matching_table_index][$p]) . ' '
 . $source_columns[$matching_table_index][$matching_tables_fields[$matching_table_index][$p]]['Type'] . ' Not Null ';
 if ($p < (sizeof($matching_tables_keys[$matching_table_index]) - 1)) {
 $query .= ', ';
 }
 }
 }
 if ($check) {
 if ($display == true) {
 echo '' . $query . '';
 }
 PMA_DBI_try_query($query, $trg_link, 0);
 }
}

/**
* PMA_removeColumnsFromTargetTable() removes the columns which are present in target table but not in source table.
* @uses sizeof()
* @uses PMA_DBI_try_query()
* @uses PMA_DBI_fetch_result()
*
* @param $trg_db name of target database
* @param $trg_link connection established with target server
* @param $matching_tables array containing names of matching tables
* @param $uncommon_columns array containing the names of the column which are to be dropped from the target table
* @param $table_counter index of the matching table as in $matchiing_tables array
* @param $display true/false value
*/
function PMA_removeColumnsFromTargetTable($trg_db, $trg_link, $matching_tables, $uncommon_columns, $table_counter, $display)
{
 if (isset($uncommon_columns[$table_counter])) {
 $drop_query = "ALTER TABLE " . PMA_backquote($trg_db) . "." . PMA_backquote($matching_tables[$table_counter]);
 for ($a = 0; $a < sizeof($uncommon_columns[$table_counter]); $a++) {
 //Checks if column to be removed is a foreign key in any table
 $pk_query = "SELECT * FROM information_schema.KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA = '" . $trg_db . "'
 AND REFERENCED_TABLE_NAME = '" . $matching_tables[$table_counter]."' AND REFERENCED_COLUMN_NAME = '"
 . $uncommon_columns[$table_counter][$a] . "' AND TABLE_NAME <> REFERENCED_TABLE_NAME;";

$pk_query_result = PMA_DBI_fetch_result($pk_query, null, null, $trg_link);
            $result_size = sizeof($pk_query_result);

if ($result_size > 0) {
 for ($b = 0; $b < $result_size; $b++) {
 $drop_pk_query = "ALTER TABLE " . PMA_backquote($pk_query_result[$b]['TABLE_SCHEMA']) . "." . PMA_backquote($pk_query_result[$b]['TABLE_NAME']) . "
 DROP FOREIGN KEY " . PMA_backquote($pk_query_result[$b]['CONSTRAINT_NAME']) . ", DROP COLUMN " . PMA_backquote($pk_query_result[$b]['COLUMN_NAME']) . ";";
 PMA_DBI_try_query($drop_pk_query, $trg_link, 0);
 }
 }
 $query = "SELECT * FROM information_schema.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = '" . $trg_db . "' AND TABLE_NAME = '"
 . $matching_tables[$table_counter]. "' AND COLUMN_NAME = '" . $uncommon_columns[$table_counter][$a] . "'
 AND TABLE_NAME <> REFERENCED_TABLE_NAME;";

$result = PMA_DBI_fetch_result($query, null, null, $trg_link);

if (sizeof($result) > 0) {
 $drop_query .= " DROP FOREIGN KEY " . PMA_backquote($result[0]['CONSTRAINT_NAME']) . ",";
 }
 $drop_query .= " DROP COLUMN " . PMA_backquote($uncommon_columns[$table_counter][$a]);
 if ($a < (sizeof($uncommon_columns[$table_counter]) - 1)) {
 $drop_query .= " , " ;
 }
 }
 $drop_query .= ";" ;

if ($display == true) {
 echo '' . $drop_query . '';
 }
 PMA_DBI_try_query($drop_query, $trg_link, 0);
 }
}
/**
* PMA_indexesDiffInTables() compares the source table indexes with target table indexes and keep the indexes to be added in target table in $add_indexes_array
* indexes to be altered in $alter_indexes_array and indexes to be removed from target table in $remove_indexes_array.
* Only keyname and uniqueness characteristic of the indexes are altered.
* @uses sizeof()
* @uses PMA_DBI_get_table_indexes()
*
* @param $src_db name of source database
* @param $trg_db name of target database
* @param $src_link connection established with source server
* @param $trg_link connection established with target server
* @param $matching_tables array containing the matching tables name
* @param $source_indexes array containing the indexes of the source table
* @param $target_indexes array containing the indexes of the target table
* @param $add_indexes_array array containing the name of the column on which the index is to be added in the target table
* @param $alter_indexes_array array containing the key name which needs to be altered
* @param $remove_indexes_array array containing the key name of the index which is to be removed from the target table
* @param $table_counter number of the matching table
*/
function PMA_indexesDiffInTables($src_db, $trg_db, $src_link, $trg_link, $matching_tables, &$source_indexes, &$target_indexes, &$add_indexes_array,
 &$alter_indexes_array, &$remove_indexes_array, $table_counter)
{
 //Gets indexes information for source and target table
 $source_indexes[$table_counter] = PMA_DBI_get_table_indexes($src_db, $matching_tables[$table_counter],$src_link);
 $target_indexes[$table_counter] = PMA_DBI_get_table_indexes($trg_db, $matching_tables[$table_counter],$trg_link);
 for ($a = 0; $a < sizeof($source_indexes[$table_counter]); $a++) {
 $found = false;
 $z = 0;
 //Compares key name and non_unique characteristic of source indexes with target indexes
 /*
 * @todo compare the length of each sub part
 */
 while (($z <= sizeof($target_indexes[$table_counter])) && ($found == false))
 {
 if (isset($source_indexes[$table_counter][$a]) && isset($target_indexes[$table_counter][$z]) && $source_indexes[$table_counter][$a]['Key_name'] == $target_indexes[$table_counter][$z]['Key_name']) {
 $found = true;
 if (($source_indexes[$table_counter][$a]['Column_name'] != $target_indexes[$table_counter][$z]['Column_name']) || ($source_indexes[$table_counter][$a]['Non_unique'] != $target_indexes[$table_counter][$z]['Non_unique'])) {
 if (! (($source_indexes[$table_counter][$a]['Key_name'] == "PRIMARY") || ($target_indexes[$table_counter][$z]['Key_name'] == 'PRIMARY'))) {
 $alter_indexes_array[$table_counter][] = $source_indexes[$table_counter][$a]['Key_name'];
 }
 }
 }
 $z++;
 }
 if ($found === false) {
 if(! ($source_indexes[$table_counter][$a]['Key_name'] == 'PRIMARY')) {
 $add_indexes_array [$table_counter][] = $source_indexes[$table_counter][$a]['Column_name'];
 }
 }
 }

//Finds indexes that exist on target table but not on source table
 for ($b = 0; $b < sizeof($target_indexes[$table_counter]); $b++) {
 $found = false;
 $c = 0;
 while (($c <= sizeof($source_indexes[$table_counter])) && ($found == false))
 {
 if ($target_indexes[$table_counter][$b]['Column_name'] == $source_indexes[$table_counter][$c]['Column_name']) {
 $found = true;
 }
 $c++;
 }
 if ($found === false) {
 $remove_indexes_array[$table_counter][] = $target_indexes[$table_counter][$b]['Key_name'];
 }
 }
}

/**
* PMA_applyIndexesDiff() create indexes, alters indexes and remove indexes.
* @uses sizeof()
* @uses PMA_DBI_try_query()
*
* @param $trg_db name of target database
* @param $trg_link connection established with target server
* @param $matching_tables array containing the matching tables name
* @param $source_indexes array containing the indexes of the source table
* @param $target_indexes array containing the indexes of the target table
* @param $add_indexes_array array containing the column names on which indexes are to be created in target table
* @param $alter_indexes_array array containing the column names for which indexes are to be altered
* @param $remove_indexes_array array containing the key name of the indexes which are to be removed from the target table
* @param $table_counter number of the matching table
* @param $display true/false value
*/
function PMA_applyIndexesDiff ($trg_db, $trg_link, $matching_tables, $source_indexes, $target_indexes, $add_indexes_array, $alter_indexes_array,
 $remove_indexes_array, $table_counter, $display)
{
 //Adds indexes on target table
 if (isset($add_indexes_array[$table_counter])) {
 $sql = "ALTER TABLE " . PMA_backquote($trg_db) . "." . PMA_backquote($matching_tables[$table_counter]) . " ADD" ;
 for ($a = 0; $a < sizeof($source_indexes[$table_counter]); $a++) {
 if (isset($add_indexes_array[$table_counter][$a])) {
 for ($b = 0; $b < sizeof($source_indexes[$table_counter]); $b++) {
 if ($source_indexes[$table_counter][$b]['Column_name'] == $add_indexes_array[$table_counter][$a]) {
 if ($source_indexes[$table_counter][$b]['Non_unique'] == '0') {
 $sql .= " UNIQUE ";
 }
 $sql .= " INDEX " . PMA_backquote($source_indexes[$table_counter][$b]['Key_name']) . " (" . $add_indexes_array[$table_counter][$a] . " );";
 if ($display == true) {
 echo '' . $sql . '';
 }
 PMA_DBI_try_query($sql, $trg_link, 0);
 }
 }
 }
 }
 }
 //Alter indexes of target table

if (isset($alter_indexes_array[$table_counter])) {
 $query = "ALTER TABLE " . PMA_backquote($trg_db) . "." . PMA_backquote($matching_tables[$table_counter]);
 for ($a = 0; $a < sizeof($alter_indexes_array[$table_counter]); $a++) {
 if (isset($alter_indexes_array[$table_counter][$a])) {
 $query .= ' DROP INDEX ' . PMA_backquote($alter_indexes_array[$table_counter][$a]) . " , ADD ";
 $got_first_index_column = false;
 for ($z = 0; $z < sizeof($source_indexes[$table_counter]); $z++) {
 if ($source_indexes[$table_counter][$z]['Key_name'] == $alter_indexes_array[$table_counter][$a]) {
 if (! $got_first_index_column) {
 if ($source_indexes[$table_counter][$z]['Non_unique'] == '0') {
 $query .= " UNIQUE ";
 }
 $query .= " INDEX " . PMA_backquote($source_indexes[$table_counter][$z]['Key_name']) . " (" . PMA_backquote($source_indexes[$table_counter][$z]['Column_name']);
 $got_first_index_column = true;
 } else {
 // another column for this index
 $query .= ', ' . PMA_backquote($source_indexes[$table_counter][$z]['Column_name']);
 }
 }
 }
 $query .= " )";
 }
 }
 if ($display == true) {
 echo '' . $query . '';
 }
 PMA_DBI_try_query($query, $trg_link, 0);
 }
 //Removes indexes from target table
 if (isset($remove_indexes_array[$table_counter])) {
 $drop_index_query = "ALTER TABLE " . PMA_backquote($trg_db) . "." . PMA_backquote($matching_tables[$table_counter]);
 for ($a = 0; $a < sizeof($target_indexes[$table_counter]); $a++) {
 if (isset($remove_indexes_array[$table_counter][$a])) {
 $drop_index_query .= " DROP INDEX " . PMA_backquote($remove_indexes_array[$table_counter][$a]);
 }
 if ($a < (sizeof($remove_indexes_array[$table_counter]) - 1)) {
 $drop_index_query .= " , " ;
 }
 }
 $drop_index_query .= " ; " ;
 if ($display == true) {
 echo '' . $drop_index_query . '';
 }
 PMA_DBI_try_query($drop_index_query, $trg_link, 0);
 }
}

/**
 * PMA_displayQuery() displays a query, taking the maximum display size
 * into account
 * @uses $GLOBALS['cfg']['MaxCharactersInDisplayedSQL']
 *
 * @param $query the query to display
*/
function PMA_displayQuery($query) {
 if (strlen($query) > $GLOBALS['cfg']['MaxCharactersInDisplayedSQL']) {
 $query = substr($query, 0, $GLOBALS['cfg']['MaxCharactersInDisplayedSQL']) . '[...]';
 }
 echo '' . htmlspecialchars($query) . '';
}

/**
 * PMA_syncDisplayHeaderSource() shows the header for source database
 * @uses $_SESSION['src_type']
 * @uses $_SESSION['src_server']['host']
 *
 * @param string $src_db source db name
*/
function PMA_syncDisplayHeaderSource($src_db) {
 echo '<div id="serverstatus" style = "overflow: auto; width: 1020px; height: 220px; border-left: 1px gray solid; border-bottom: 1px gray solid; padding:0px; margin-bottom: 1em "> ';

echo '<table id="serverstatusconnections" class="data" width="55%">';
 echo '<tr>';
 echo '<th>' . __('Source database') . ': ' . htmlspecialchars($src_db) . ' (';
 if ('cur' == $_SESSION['src_type']) {
 echo __('Current server');
 } else {
 echo __('Remote server') . ' ' . $_SESSION['src_server']['host'];
 }
 echo ')</th>';
 echo '<th>' . __('Difference') . '</th>';
 echo '</tr>';
}

/**
 * PMA_syncDisplayHeaderTargetAndMatchingTables() shows the header for target database and the matching tables
 * @uses $_SESSION['trg_type']
 * @uses $_SESSION['trg_server']['host']
 *
 * @param string $trg_db target db name
 * @param array $matching_tables
 * @return boolean $odd_row current value of this toggle
*/
function PMA_syncDisplayHeaderTargetAndMatchingTables($trg_db, $matching_tables) {
 echo '<table id="serverstatusconnections" class="data" width="43%">';
 echo '<tr>';
 echo '<th>' . __('Target database') . ': '. htmlspecialchars($trg_db) . ' (';
 if ('cur' == $_SESSION['trg_type']) {
 echo __('Current server');
 } else {
 echo __('Remote server') . ' ' . $_SESSION['trg_server']['host'];
 }
 echo ')</th>';
 echo '</tr>';
 $odd_row = false;
 foreach ($matching_tables as $tbl_name) {
 $odd_row = PMA_syncDisplayBeginTableRow($odd_row);
 echo '<td> ' . htmlspecialchars($tbl_name) . '</td>';
 echo '</tr>';
 }
 return $odd_row;
}

/**
 * PMA_syncDisplayBeginTableRow() displays the TR tag for alternating colors
 *
 * @param boolean $odd_row current status of the toggle
 * @return boolean $odd_row final status of the toggle
*/
function PMA_syncDisplayBeginTableRow($odd_row) {
 $odd_row = ! $odd_row;
 echo '<tr height="32" class=" ';
 echo $odd_row ? 'odd' : 'even';
 echo '">';
 return $odd_row;
}
?>