php 数据库图片信息及文件夹下的图片删除

<?php
/**
*图片管理
* 2011/8/20
* kcj
* */
include "isLogin.php";

?>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
        <title>后台管理</title>
        <meta name="Author" content="kcj" />
        <meta name="Keywords" content="php,lampbrother" />
        <link rel="stylesheet" type="text/css" href="style/lampcms.css">
        <script src="javascript/common.js"></script>
    </head>
    <body>
        <div id="main">
           后台管理->文章管理
            <form method="post" action="" >
            <div class="msg-box">
                <ul class="viewmess">

                 <li class="dark-row">


                        <span class="list_width width_font">图片名称</span>
                        <span class="list_width width_font">图片路径</span>
                        <span class="list_width width_font">添加时间</span>
                        <span class="list_width width_font">操作</span>

                    </li>

                        <?php
                        /**
                         * 图片管理
                         * 2011/8/20
                         * kcjs
                         **/
                        require "../conn/conn.php";
                        if($_GET["del"]){                   //删除图片信息及文件夹下的图片(注意不要犯逻辑性的错误，当然可以分开写这两个的删除)
                            $id=$_GET["del"];
                            $sql2="select*from pic where id=".$id;
                            $rst2=mysql_query($sql2);
                            $row=mysql_fetch_array($rst2);
                            $sql="delete from pic where id=".$id;
                            mysql_query($sql);
                            $filename=$row['picpath'];
                            if(file_exists($filename)){
                                unlink($filename);
                            }else {
                                echo "图片路径不正确";
                            }

                        }

                        $sql="select*from pic";
                        $rst=mysql_query($sql);
                        $totalnum=mysql_num_rows($rst); //print_r($totalnum)

补充：Web开发 , php ,