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我想出了如何将用户信息从注册页面写入 .dat 文件，但我一直在尝试通过与 .dat 进行交叉检查来验证登录页面上的用户是否匹配。

我的登录页面代码包括：

<?php

include "functions.inc"; 

// Useful variables
$datafile = "users.dat";


if (array_key_exists('submit', $_POST))
            // Function to check the password length

            {
            $the_user = $_POST['newuser'];



        // Load the file of users and store it in $users
        $users = arrayfile_to_array($datafile);

            $users = arrayfile_to_array($datafile);
            // Validate user name and password
            }
           else 
            {
                $users = arrayfile_to_array($datafile);

                    // Validate the email address
    if (!user_unique($users, $the_user['newuser']))
        echo "User already exists!";

            }


            if (array_key_exists('submit', $_POST))
// Function to check the password length
            {
            header('Location: 04invoice.php');
            }
   else 
   if (array_key_exists('register', $_POST))
   {
        header('Location: 03registration.php');
   }


?>
<!DOCTYPE html>
<html> <center>
    <style>
        body
        {
            background-color:aqua;
            font-family:"Times New Roman";
            font-size:20px;
        }
        h1
        {
            color:orange;
            text-align: center;
        }
        p
        {
            font-size:24px;
        }
        table
        {
            background-color:green;
            font-family:"Helvetica";
            font-size:20px;
            font-weight:bold;
        }
    </style>
    <h1>
        Welcome to the Pay'N'Go Kiosk
    </h1>
    <body>
        <form action= "<?php $_SERVER["PHP_SELF"] ?>" method="POST">
            <p>Username:    <br>
<input style="background-color: yellow; color:black" type='text' name='username'
                              value='<?php if(isset($_POST['newuser[username]'])) 
        echo $_POST['newuser[username]'] ?>'>
                              <BR>
            Password:   <br>
<input style="background-color:magenta" type='password' name='newuser[password]'><BR>


            <input type='submit' name='submit' value='Sign In'>
            <br/>
            Not a user? Sign up today! </br>
            <a href='03registration.php'>register here!</a>
        </form>
    </body>
</center>
</html>

我正在尝试使用 arrayfile_to_array 来调出包含所有数组的文件，但我不知道如何使用它。任何提示将不胜感激。

 // Open the file

    // If the file doesn't exist, create it.
    if (!file_exists($datafile))
    {
        $users = array();
        array_to_arrayfile($users, $datafile);
    }
    else
    {
        $users = arrayfile_to_array($datafile);
    }
}
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