Untitled

<?php
 checkPass();
 function readFilez()
{
 $lines = file('./passwd.txt');
 foreach ($lines as $line)
 {
  $line = trim($line);
  $username = strtok($line, ':');
  $password = strtok("\n");
  $arrayz[$username] = $password;
 }
  return $arrayz;
}

 function checkPass()
{
 $arrayx = readFilez();
 print_r($arrayx);
 $user = $_POST["user"];
 $pass = $_POST["pw"];
 $file = fopen('./passwd.txt', 'r');
 if (!isset($_POST["user"]) || !isset($_POST["pw"]))
        { echo '<script type = "javascript"> alert("Please complete all fields."); </script>'; }
 else
 {
  foreach ($arrayx as $key => $value)
  {
   if ($user != $key)
   {
    echo '<script type = "javascript"> alert("Username does not exist."); </script>';
    return false;
   }
   else
   {
    if ($arrayx[$user] != $pass)
    {
        echo '<script type = "javascript"> alert("Invalid password."); </script>';
        return false;
    }
    else
        $username = $user;
   }
  }
 }
 fclose($file);
}

print <<<PAGE
<html>
<head>
        <title>Login Page</title>
        <style type = "text/css">
                table
                {
                        margin-left: auto;
                        margin-right: auto;
                        font-family: Georgia, sans-serif;
                        font-size: 14pt;
                }
                h3
                {
                        text-align: center;
                        font-size: 16pt;
                }
        </style>
</head>
<body>
        <h3>Please sign in or create an account.</h3>
        <form method = "post" action = "login.php">
                <table>
                        <tr>
                                <td>Username: <input type = "text" name = "user" /></td>
                                <td>Password: <input type = "password" name = "pw" /></td>
                                <td>
                                <input type = "submit" value = "Login" />
                                <input type = "hidden" name = "username" value = "$username" />
                                </td>
                        </tr>
                </table>
        </form>
        <h3>Don't have a username? <a href = "./createaccount.php">Create an account.</a></h3>
</body>
</html>
PAGE;
?>