PHP development corporate website tutorial: Delete contact us information

We have already completed the function of adding and modifying, now let’s write the function of deleting

Click delete, then pass the parameter id, receive the parameter id on this page and perform the deletion operation based on the id

The code is as follows:

<?php
    //删除练习我们信息部分代码
    require_once('conn.php');
    $id = $_GET['id'];
    $sql = "delete from contact where id='$id'";
    $res = mysql_query($sql);
    if($res){
        echo "<script>alert('删除成功');location.href='contact.php';</script>";
    }else{
        echo "<script>alert('删除失败');location.href='contact.php';</script>";
    }
?>