php 注册与登录

<body background="timg.jpg">
<div class="dak">
    <div class="zuk">
     <div>
         <h1 style="text-align: center">注册与登陆</h1>
     </div>
        <div class="zcdl">
            <div class="zc">
                <h2 style="margin-left: 80px">登录</h2>
                <form method="post" action="login.php">
                    <input class="dhk" type="text" onkeyup="value=value.replace(/[/W]/g,'')" name="uname" placeholder="用户名" value=""><br><br>
                    <input class="dhk" type="password" onkeyup="this.value=this.value.replace(/[^d]/g,'') " onafterpaste="this.value=this.value.replace(/[^d]/g,'') " name="pwd" placeholder="密码" value=""><br><br><br><br>
                    <input class="tj" type="submit"  value="登录">
                </form>
            </div>
            <div class="dl">
                <h2 style="margin-left: 80px">注册</h2>
                <form method="post" action="rgr.php">
                    <input class="dhk" type="text" onkeyup="value=value.replace(/[/W]/g,'')" name="uname" placeholder="用户名" value=""><br><br>
                    <input class="dhk" type="password" onkeyup="this.value=this.value.replace(/[^d]/g,'') " onafterpaste="this.value=this.value.replace(/[^d]/g,'') " name="pwd" placeholder="密码" value=""><br><br>
                    <br><br>
                    <input class="tj" type="submit"  value="注册">
                    <br><br><br><br>
                </form>
                <div>
                    <form method="post" action="scyh.php">
                        <input class="tj" type="submit" value="注销用户">
                    </form>
                </div>
            </div>

        </div>
    </div>
</div>

<?php
header("content-type:text/html; charset=utf-8");
require_once "../dbdb/DBDA.class.php";
//$pwd = md5($_POST['pwd']);
$db = new DBDA();
$sql = "select count(*) from uesr WHERE uname= '{$_POST["uname"]}'";
$result = $db->strQuery($sql);
if ($result !='0'){
    exit( "注册成功");
}else{
    $sql_insert = "insert into uesr VALUES (null,'{$_POST["uname"]}','{$_POST["pwd"]}')";
    $result2= $db->Query($sql_insert,0);
    var_dump($result2);
}

<?php
header("content-type:text/html; charset=utf-8");
require_once "../dbdb/DBDA.class.php";
session_start();
$db=new DBDA();
$sql = "select count(*) from uesr WHERE uname = '{$_POST["uname"]}' AND is_delede=0";
$result = $db->StrQuery($sql);

$q = $_POST["uname"];
if ($result != "0"){
    header("location:xiangmu.php");
    $_SESSION['uesr']=$q;
}else{
    header("location:denglu.php?ret=1");
}


</body>
</html>