Full Database Backup

Hey Y!!

For my current project I needed to perform a full database backup. I took the following code from David Walsh and adapted into usage in Yii. I wanted to use the existing Yii::app()->db connection instead of having to create a new one using mysql_connect($host,$user,$pass). I have the function in a Helpers class at the moment. Example usage:

Helpers::backupDb('/home/user/backups/db.sql'); // Performs full backup
Helpers::backupDb('/home/user/backups/db.sql', 'Users'); // Backs up `Users` table
Helpers::backupDb('/home/user/backups/db.sql', 'Users, Orders, Categories'); // Multiple tables specified
Helpers::backupDb('/home/user/backups/db.sql', array('Users', 'Orders', 'Categories'); // Does the same as above

/*
* PHP MySQL Backup Function
* Adapted to Yii from David Walsh's code http://davidwalsh.name/backup-mysql-database-php 
*/

public static function backupDb($filepath, $tables = '*') {
    if ($tables == '*') {
        $tables = array();
        $tables = Yii::app()->db->schema->getTableNames();
    } else {
        $tables = is_array($tables) ? $tables : explode(',', $tables);
    }
    $return = '';

    foreach ($tables as $table) {
        $result = Yii::app()->db->createCommand('SELECT * FROM ' . $table)->query();
        $return.= 'DROP TABLE IF EXISTS ' . $table . ';';
        $row2 = Yii::app()->db->createCommand('SHOW CREATE TABLE ' . $table)->queryRow();
        $return.= "\n\n" . $row2['Create Table'] . ";\n\n";
        foreach ($result as $row) {
            $return.= 'INSERT INTO ' . $table . ' VALUES(';
            foreach ($row as $data) {
                $data = addslashes($data);

                // Updated to preg_replace to suit PHP5.3 +
                $data = preg_replace("/\n/", "\\n", $data);
                if (isset($data)) {
                    $return.= '"' . $data . '"';
                } else {
                    $return.= '""';
                }
                $return.= ',';
            }
            $return = substr($return, 0, strlen($return) - 1);
            $return.= ");\n";
        }
        $return.="\n\n\n";
    }
    //save file
    $handle = fopen($filepath, 'w+');
    fwrite($handle, $return);
    fclose($handle);
}

Cheers!
jc