mysql删除地址栏所指定的id

<?php  
$conn = mysql_connect('localhost','root','1111');
if (!$conn) {
	echo 'OK ';
	exit;
}

$sql = 'use test';

$rs =mysql_query($sql,$conn);

$sql ='set names utf8';

mysql_query($sql,$conn);

$id = isset($_GET['id'])?$_GET['id']:0;

$sql = 'delete from stu where id ='.$id;

if (mysql_query($sql,$conn)) {
	echo '删除成功';
}else{
	echo '删除失败';
}
?>