18-2 login.php

<?php
session_start();
$id="admin";
$pass="12345";

$tool="已登入 [<input type='submit' value='登出'>]
<p><a href='index.php'>重新播放</a></p>";

$form="
<form>
  <table>
    <tr><td>帳號：</td><td></td></tr>
    <tr><td>密碼：</td><td></td></tr>
    <tr><td align='center'>
      <input type='submit' value='登入'>
    </td></tr>
  </table>
</form>";

if($_GET['op']=='logout'){
    $_SESSION['login']=false;
}else{
    if($_POST['user_id']==$id and $_POST['passwd']==$pass){
        $_SESSION['login']=true;
    }else{
        $_SESSION['login']=false;
    }
}
header("location:index.php");

?>