php 备份mysql数据库（joomla数据库可直接使用，其他数据库稍作修改即可）

<?php
require_once('configuration.php');
$jconfig = new JConfig();
$connect = mysql_connect($jconfig->host ,$jconfig->user, $jconfig->password);
$result = mysql_list_tables($jconfig->db); 
$tables = array();
while ($row = mysql_fetch_row($result)) {
	$tables[] =  $row[0];
}

mysql_select_db($jconfig->db);
$sql = '';
foreach($tables as $table){
	$sql .= backupTable($table);
}

$r = file_put_contents('tmp/backup_'.date('Y-m-d-H-i-s').'.sql', $sql);

if($r){
	die('success');
}else{
	die('lalala');
}

mysql_close($connect);

function backupTable($table){
	$sqltxt = "DROP TABLE IF EXISTS $table;\n";
	
	$result = mysql_query("SHOW CREATE TABLE $table");
	$row = mysql_fetch_assoc($result);
	$createsql = $row['Create Table'];
	$sqltxt .= $createsql.";\n\n";

	$result = mysql_query("SELECT * FROM $table");
	
	$rows = array();
	while($row = mysql_fetch_assoc($result)){
		$fields = array();
		foreach($row as $field){
			$fields[] = '\''.mysql_escape_string($field).'\'';
		}
		
		$rows[] = '('.implode(',', $fields).')';
	}
	if(!empty($rows)){
		$sqltxt .= "INSERT INTO `$table` VALUES".implode(",\n", $rows).";\n";
	}
	
	
	$sqltxt .= "\n";

	return $sqltxt;
}