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Current File : /srv/wp/nallaram.agtdemo.in/www/wp-content/plugins/better-search-replace/includes/class-bsr-db.php
<?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 {
			// Exit early if $data is a string but has no search matches.
			if ( is_string( $data ) ) {
				$has_match = $case_insensitive ? false !== stripos( $data, $from ) : false !== strpos( $data, $from );
				if ( ! $has_match ) {
					return $data;
				}
			}

			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 ( 'object' == gettype( $data ) ) {
				if($this->is_object_cloneable($data)) {
					$_tmp = clone $data;
					$props = get_object_vars( $data );
					foreach ( $props as $key => $value ) {
						// Integer properties are crazy and the best thing we can do is to just ignore them.
						// see http://stackoverflow.com/a/10333200
						if ( is_int( $key ) ) {
							continue;
						}

						// Skip any representation of a protected property
						// https://github.com/deliciousbrains/better-search-replace/issues/71#issuecomment-1369195244
						if ( is_string( $key ) && 1 === preg_match( "/^(\\\\0).+/im", preg_quote( $key ) ) ) {
							continue;
						}

						$_tmp->$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 );

		if ( PHP_VERSION_ID >= 70000 ) {
			$unserialized_string = @unserialize( $serialized_string, array('allowed_classes' => false ) );
		} else {
			$unserialized_string = @BSR\Brumann\Polyfill\Unserialize::unserialize( $serialized_string, array( 'allowed_classes' => false ) );
		}

		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() );
	}

	/**
	 * Check if a given object can be cloned.
	 *
	 * @param object $object
	 *
	 * @return bool
	 */
	private function is_object_cloneable( $object ) {
		return ( new \ReflectionClass( get_class( $object ) ) )->isCloneable();
	}
}

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