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<?php
/**
* Processes database-related functionality.
* @since 1.0
*
* @package Better_Search_Replace
* @subpackage Better_Search_Replace/includes
*/
// Prevent direct access.
if ( ! defined( 'BSR_PATH' ) ) exit;
class BSR_DB {
/**
* The page size used throughout the plugin.
* @var int
*/
public $page_size;
/**
* The name of the backup file.
* @var string
*/
public $file;
/**
* The WordPress database class.
* @var WPDB
*/
private $wpdb;
/**
* Initializes the class and its properties.
* @access public
*/
public function __construct() {
global $wpdb;
$this->wpdb = $wpdb;
$this->page_size = $this->get_page_size();
}
/**
* Returns an array of tables in the database.
* @access public
* @return array
*/
public static function get_tables() {
global $wpdb;
if ( function_exists( 'is_multisite' ) && is_multisite() ) {
if ( is_main_site() ) {
$tables = $wpdb->get_col( 'SHOW TABLES' );
} else {
$blog_id = get_current_blog_id();
$tables = $wpdb->get_col( "SHOW TABLES LIKE '" . $wpdb->base_prefix . absint( $blog_id ) . "\_%'" );
}
} else {
$tables = $wpdb->get_col( 'SHOW TABLES' );
}
return $tables;
}
/**
* Returns an array containing the size of each database table.
* @access public
* @return array
*/
public static function get_sizes() {
global $wpdb;
$sizes = array();
$tables = $wpdb->get_results( 'SHOW TABLE STATUS', ARRAY_A );
if ( is_array( $tables ) && ! empty( $tables ) ) {
foreach ( $tables as $table ) {
$size = round( $table['Data_length'] / 1024 / 1024, 2 );
$sizes[$table['Name']] = sprintf( __( '(%s MB)', 'better-search-replace' ), $size );
}
}
return $sizes;
}
/**
* Returns the current page size.
* @access public
* @return int
*/
public function get_page_size() {
$page_size = get_option( 'bsr_page_size' ) ? get_option( 'bsr_page_size' ) : 20000;
return absint( $page_size );
}
/**
* Returns the number of pages in a table.
* @access public
* @return int
*/
public function get_pages_in_table( $table ) {
if ( false === $this->table_exists( $table ) ) {
return 0;
}
$table = esc_sql( $table );
$rows = $this->wpdb->get_var( "SELECT COUNT(*) FROM `$table`" );
$pages = ceil( $rows / $this->page_size );
return absint( $pages );
}
/**
* Gets the total number of pages in the DB.
* @access public
* @return int
*/
public function get_total_pages( $tables ) {
$total_pages = 0;
foreach ( $tables as $table ) {
// Get the number of rows & pages in the table.
$pages = $this->get_pages_in_table( $table );
// Always include 1 page in case we have to create schemas, etc.
if ( $pages == 0 ) {
$pages = 1;
}
$total_pages += $pages;
}
return absint( $total_pages );
}
/**
* Gets the columns in a table.
* @access public
* @param string $table The table to check.
* @return array
*/
public function get_columns( $table ) {
$primary_key = null;
$columns = array();
if ( false === $this->table_exists( $table ) ) {
return array( $primary_key, $columns );
}
$fields = $this->wpdb->get_results( 'DESCRIBE ' . $table );
if ( is_array( $fields ) ) {
foreach ( $fields as $column ) {
$columns[] = $column->Field;
if ( $column->Key == 'PRI' ) {
$primary_key = $column->Field;
}
}
}
return array( $primary_key, $columns );
}
/**
* Adapated from interconnect/it's search/replace script.
*
* Modified to use WordPress wpdb functions instead of PHP's native mysql/pdo functions,
* and to be compatible with batch processing via AJAX.
*
* @link https://interconnectit.com/products/search-and-replace-for-wordpress-databases/
*
* @access public
* @param string $table The table to run the replacement on.
* @param int $page The page/block to begin the query on.
* @param array $args An associative array containing arguements for this run.
* @return array
*/
public function srdb( $table, $page, $args ) {
// Load up the default settings for this chunk.
$table = esc_sql( $table );
$current_page = absint( $page );
$pages = $this->get_pages_in_table( $table );
$done = false;
$args['search_for'] = str_replace( '#BSR_BACKSLASH#', '\\', $args['search_for'] );
$args['replace_with'] = str_replace( '#BSR_BACKSLASH#', '\\', $args['replace_with'] );
$table_report = array(
'change' => 0,
'updates' => 0,
'start' => microtime( true ),
'end' => microtime( true ),
'errors' => array(),
'skipped' => false
);
// Get a list of columns in this table.
list( $primary_key, $columns ) = $this->get_columns( $table );
// Bail out early if there isn't a primary key.
if ( null === $primary_key ) {
$table_report['skipped'] = true;
return array( 'table_complete' => true, 'table_report' => $table_report );
}
$current_row = 0;
$start = $page * $this->page_size;
$end = $this->page_size;
// Grab the content of the table.
$data = $this->wpdb->get_results( "SELECT * FROM `$table` LIMIT $start, $end", ARRAY_A );
// Loop through the data.
foreach ( $data as $row ) {
$current_row++;
$update_sql = array();
$where_sql = array();
$upd = false;
foreach( $columns as $column ) {
$data_to_fix = $row[ $column ];
if ( $column == $primary_key ) {
$where_sql[] = $column . ' = "' . $this->mysql_escape_mimic( $data_to_fix ) . '"';
continue;
}
// Skip GUIDs by default.
if ( 'on' !== $args['replace_guids'] && 'guid' == $column ) {
continue;
}
if ( $this->wpdb->options === $table ) {
// Skip any BSR options as they may contain the search field.
if ( isset( $should_skip ) && true === $should_skip ) {
$should_skip = false;
continue;
}
// If the Site URL needs to be updated, let's do that last.
if ( isset( $update_later ) && true === $update_later ) {
$update_later = false;
$edited_data = $this->recursive_unserialize_replace( $args['search_for'], $args['replace_with'], $data_to_fix, false, $args['case_insensitive'] );
if ( $edited_data != $data_to_fix ) {
$table_report['change']++;
$table_report['updates']++;
update_option( 'bsr_update_site_url', $edited_data );
continue;
}
}
if ( '_transient_bsr_results' === $data_to_fix || 'bsr_profiles' === $data_to_fix || 'bsr_update_site_url' === $data_to_fix || 'bsr_data' === $data_to_fix ) {
$should_skip = true;
}
if ( 'siteurl' === $data_to_fix && $args['dry_run'] !== 'on' ) {
$update_later = true;
}
}
// Run a search replace on the data that'll respect the serialisation.
$edited_data = $this->recursive_unserialize_replace( $args['search_for'], $args['replace_with'], $data_to_fix, false, $args['case_insensitive'] );
// Something was changed
if ( $edited_data != $data_to_fix ) {
$update_sql[] = $column . ' = "' . $this->mysql_escape_mimic( $edited_data ) . '"';
$upd = true;
$table_report['change']++;
}
}
// Determine what to do with updates.
if ( $args['dry_run'] === 'on' ) {
// Don't do anything if a dry run
} elseif ( $upd && ! empty( $where_sql ) ) {
// If there are changes to make, run the query.
$sql = 'UPDATE ' . $table . ' SET ' . implode( ', ', $update_sql ) . ' WHERE ' . implode( ' AND ', array_filter( $where_sql ) );
$result = $this->wpdb->query( $sql );
if ( ! $result ) {
$table_report['errors'][] = sprintf( __( 'Error updating row: %d.', 'better-search-replace' ), $current_row );
} else {
$table_report['updates']++;
}
}
} // end row loop
if ( $current_page >= $pages - 1 ) {
$done = true;
}
// Flush the results and return the report.
$table_report['end'] = microtime( true );
$this->wpdb->flush();
return array( 'table_complete' => $done, 'table_report' => $table_report );
}
/**
* Adapated from interconnect/it's search/replace script.
*
* @link https://interconnectit.com/products/search-and-replace-for-wordpress-databases/
*
* Take a serialised array and unserialise it replacing elements as needed and
* unserialising any subordinate arrays and performing the replace on those too.
*
* @access private
* @param string $from String we're looking to replace.
* @param string $to What we want it to be replaced with
* @param array $data Used to pass any subordinate arrays back to in.
* @param boolean $serialised Does the array passed via $data need serialising.
* @param sting|boolean $case_insensitive Set to 'on' if we should ignore case, false otherwise.
*
* @return string|array The original array with all elements replaced as needed.
*/
public function recursive_unserialize_replace( $from = '', $to = '', $data = '', $serialised = false, $case_insensitive = false ) {
try {
if ( is_string( $data ) && ! is_serialized_string( $data ) && ( $unserialized = $this->unserialize( $data ) ) !== false ) {
$data = $this->recursive_unserialize_replace( $from, $to, $unserialized, true, $case_insensitive );
}
elseif ( is_array( $data ) ) {
$_tmp = array( );
foreach ( $data as $key => $value ) {
$_tmp[ $key ] = $this->recursive_unserialize_replace( $from, $to, $value, false, $case_insensitive );
}
$data = $_tmp;
unset( $_tmp );
}
// Submitted by Tina Matter
elseif ( is_object( $data ) ) {
if ('__PHP_Incomplete_Class' !== get_class($data)) {
$_tmp = $data;
$props = get_object_vars( $data );
foreach ( $props as $key => $value ) {
$_tmp->$key = $this->recursive_unserialize_replace( $from, $to, $value, false, $case_insensitive );
}
$data = $_tmp;
unset( $_tmp );
}
}
elseif ( is_serialized_string( $data ) ) {
$unserialized = $this->unserialize( $data );
if ( $unserialized !== false ) {
$data = $this->recursive_unserialize_replace( $from, $to, $unserialized, true, $case_insensitive );
}
}
else {
if ( is_string( $data ) ) {
$data = $this->str_replace( $from, $to, $data, $case_insensitive );
}
}
if ( $serialised ) {
return serialize( $data );
}
} catch( Exception $error ) {
}
return $data;
}
/**
* Updates the Site URL if necessary.
* @access public
* @return boolean
*/
public function maybe_update_site_url() {
$option = get_option( 'bsr_update_site_url' );
if ( $option ) {
update_option( 'siteurl', $option );
delete_option( 'bsr_update_site_url' );
return true;
}
return false;
}
/**
* Mimics the mysql_real_escape_string function. Adapted from a post by 'feedr' on php.net.
* @link http://php.net/manual/en/function.mysql-real-escape-string.php#101248
* @access public
* @param string $input The string to escape.
* @return string
*/
public function mysql_escape_mimic( $input ) {
if ( is_array( $input ) ) {
return array_map( __METHOD__, $input );
}
if ( ! empty( $input ) && is_string( $input ) ) {
return str_replace( array( '\\', "\0", "\n", "\r", "'", '"', "\x1a" ), array( '\\\\', '\\0', '\\n', '\\r', "\\'", '\\"', '\\Z' ), $input );
}
return $input;
}
/**
* Return unserialized object or array
*
* @param string $serialized_string Serialized string.
* @param string $method The name of the caller method.
*
* @return mixed, false on failure
*/
public static function unserialize( $serialized_string ) {
if ( ! is_serialized( $serialized_string ) ) {
return false;
}
$serialized_string = trim( $serialized_string );
$unserialized_string = @unserialize( $serialized_string );
return $unserialized_string;
}
/**
* Wrapper for str_replace
*
* @param string $from
* @param string $to
* @param string $data
* @param string|bool $case_insensitive
*
* @return string
*/
public function str_replace( $from, $to, $data, $case_insensitive = false ) {
if ( 'on' === $case_insensitive ) {
$data = str_ireplace( $from, $to, $data );
} else {
$data = str_replace( $from, $to, $data );
}
return $data;
}
/**
* Checks whether a table exists in DB.
*
* @param $table
*
* @return bool
*/
private function table_exists( $table ) {
return in_array( $table, $this->get_tables() );
}
}