PHP 备份 MySQL 数据库的脚本

<?php set_time_limit(0);
// 备份数据库
$host = "localhost"; // 服务器地址
$user = "root"; //数据库账号
$password = ""; //数据库密码
$dbname = "mysql"; //数据库名称
$charset = 'utf8'; //数据库编码 gbk、utf8

// 以下的代码不要修改了！！
if (!mysql_connect($host, $user, $password)) { // 连接mysql数据库
	exit('Error: can\'t connect to server.'）;
} 
if (!mysql_select_db($dbname)) {// 是否存在该数据库
	echo 'Error: no database ' . $dbname;
	exit;
} 
mysql_query("set names '$charset'");
$mysql = "set charset $charset;\r\n";
$q1 = mysql_query("show tables");
while ($t = mysql_fetch_array($q1)) {
	$table = $t[0];
	$q2 = mysql_query("show create table `$table`");
	$sql = mysql_fetch_array($q2);
	$mysql .= $sql['Create Table'] . ";\r\n";
	$q3 = mysql_query("select * from `$table`");
	while ($data = mysql_fetch_assoc($q3)) {
		$keys = array_keys($data);
		$keys = array_map('addslashes', $keys);
		$keys = join('`,`', $keys);
		$keys = "`" . $keys . "`";
		$vals = array_values($data);
		$vals = array_map('addslashes', $vals);
		$vals = join("','", $vals);
		$vals = "'" . $vals . "'";
		$mysql .= "insert into `$table`($keys) values($vals);\r\n";
	} 
} 

$filename = $dbname . date('Ymjgi') . ".sql"; //存放路径，默认存放到项目最外层
$fp = fopen($filename, 'w');
fputs($fp, $mysql);
fclose($fp);
echo '<a href="'.$filename .'">'.$filename .'</a>';
?>