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我在使用外部登录文件时遇到问题。基本上我想去一个外部登录 php 页面并验证表单。验证表单后，我想重定向回上一页并开始会话。我遇到的问题是我的会话没有启动（即它不会将登录表单更改为注销按钮）。我的代码在下面。提前致谢。

索引.php

<?
    session_start();
    include('phpFunctions/databaseConnect.php');
    include('phpFunctions/reusableFunctions.php');
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="content-type" content="text/html;charset=utf-8" />
        <title>Unnamed classifieds site</title>
        <script type="text/javascript" src="js/formValidation.js"></script>
    </head>
    <body>
        <div class="wrapper">
            <div class="login">
                <? if(isset($_GET['error'])){$error = $_GET['error'];} ?>
                <span id="error_message" class="error"><? if(isset($error)){echo $error;} ?><span id="login_error"></span></span>
                <? login(); ?>
            </div>
            <div class="mainLogo">
                <? mainLogo(); ?>
            </div>
            <div class="search_form">
                <span id="error_message" class="error"><span id="search_error"></span></span>
                <? search(); ?>
            </div>
            <div class="footer">
                <? footer(); ?>
            </div>
        </div>
    </body>
</html>

登录.php

<?

    include('phpFunctions/databaseConnect.php');
    $error = array();

    $email = $_POST['email'];
    $password = $_POST['password'];

    if(empty($email) || empty($password)){
        $error[] = 'Please fill in the form!';
    }else if(!preg_match('/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/',$email)){
        $error[] = 'Your email is not in the correct format!';
    }else if(strlen($password) < 6){
        $error[] = 'Your password must be at least 6 characters long!';
    }else{
        $hashPass = md5($password);

        $query_user = mysql_query("SELECT * FROM users WHERE email='$email' AND password='$hashPass'") or die(mysql_error());
        $num_rows = mysql_num_rows($query_user);

        if($num_rows == 1){
           while($row = mysql_fetch_array($query_user)){
               $_SESSION['id'] = $row['id'];
               header('Location:index.php');
           }
        }else{
            $error[] = 'Sorry no user with that email or password!';
        }
    }

    if(!empty($error)){
        foreach($error as $key => $values){
            $error_message.= "$values";
        }

        header('Location: index.php?error='.  urlencode($error_message));
    }

?>
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