我在verify==verify1條件下echo了驗證成功。為什么我用戶名、密碼、驗證碼都沒有輸，我點登陸，跳轉的都是驗證成功的。

<?php

require_once '../include.php';

$username=$_POST['username'];

$password=md5($_POST['password']);

$verify=$_POST['verify'];

$verify1=$_SESSION['verify'];

if($verify==$verify1){

$sql="select*from jin_admin where username='{$username}'and password='{$password}'";

$res=checkAdmin($sql);

print_r($res);

echo "dengluchenggong";

}

else {

echo"<script>alert('驗證碼錯誤');</script>";

echo"<script>window.location='login.php';</script>";

}