MySQL DB Backup: Generate backup files of large MySQL databases

MySQL DB export class, version 1.1.1

WHAT'S NEW?
- The class now is PHP5 compatible

version 1.0.1

WHAT'S NEW?
- The class now can make backups from big databases (+16M in SQL code) when 
it creates a backup file or saves the backup file in users computer.
- Added the task MSX_APPEND

HOW TO USE

1. Create the instance of MySQL_Export class.
2. Define necessary properties.
3. Call Execute() method to create backup.

require_once 'mysql_export.class.php';
$backup_obj = new MySQL_DB_Backup();
$backup_obj->server = 'localhost';
$backup_obj->username = 'username';
$backup_obj->password = 'password';
$backup_obj->database = 'dbname';
$backup_obj->tables = array();
$backup_obj->create_tables = true;
$backup_obj->drop_tables = true;
$backup_obj->struct_only = false;
$backup_obj->locks = true;
$backup_obj->comments = true;
$backup_obj->fname_format = 'd_m_y__H_i_s';
$backup_obj->null_values = array( '0000-00-00', '00:00:00', '0000-00-00 00:00:00');
if (!$backup_obj->Execute(MSX_DOWNLOAD, '', true))
{
  die($backup_obj->error);
}


PUBLIC PROPERTIES

var $server = 'localhost';
The name of MySQL server.

var $port = 3306;
The port of MySQl server.

var $username = 'root';
Database username.

var $password = '';
Database password.

var $database = '';
Name of the database.

var $link_id = -1;
MySQL link identifier of the current connection. You can set this if you
want to connect the MySQL server by your own.

var $connected = false;
Set true if the connection is already established before calling Execute().

var $tables = array();
Tables you want to backup. All tables in the database will be backed up if
this array is empty.

var $create_tables = true;
Backup the structure of tables if true.

var $drop_tables = true;
Add DROP TABLE IF EXISTS queries before CREATE TABLE in backup file.

var $struct_only = false;
Only structure of the tables will be backed up if true.

var $locks = true;
Add LOCK TABLES and UNLOCK TABLES queries before and after each INSERT queries
block.

var $comments = true;
Include comments in backup file if true.

var $backup_dir = '';
Directory on the server where the backup file will be placed. Used if task
parameter equals to MSX_SAVE or MSX_DOWNLOAD in Execute() method.

var $fname_format = 'd_m_y__H_i_s';
Default file name format.

var $error = '';
Error message.

var $null_values = array( '0000-00-00', '00:00:00', '0000-00-00 00:00:00');
Values which must be interpreted as NULL


PUBLIC METHODS

function Execute($task = MSX_STRING, $fname = '', $compress = false)
$task - operation to perform: MSX_STRING - return SQL commands as a string;
  MSX_SAVE - create the backup file on the server; MSX_DOWNLOAD - save backup
  file in the user's computer; MSX_APPEND - append backup in the file on the
  server.
$fname - optional name of backup file.
$compress - use GZip compression?