php实例之基于文件的登录验证

php基于文件的登录验证，代码如下：

<?php
/**
* 基于文件的登录
* edit by www.jb200.com
*/
   $authorized = FALSE;

   if (isset($_SERVER['PHP_AUTH_USER']) &&
   isset($_SERVER['PHP_AUTH_PW'])) {
      $authFile = file("./password.txt"); // 密码文件

      foreach ($authFile as $login) {
         list($username, $password) = explode(":", $login);
         $password = trim($password);
         if (($username == $_SERVER['PHP_AUTH_USER']) &&
  ($password == md5($_SERVER['PHP_AUTH_PW']))) {
            $authorized = TRUE;
            break;
         }
      }
   }

   // 验证失败则显示提示框或401错误
   if (! $authorized) {
      header('WWW-Authenticate: Basic Realm="Secret
      Stash"');
      header('HTTP/1.0 401 Unauthorized');
      print('您必须提供正确的凭证!');
      exit;
   }

?>

<!-- password.txt
joe:60d99e58d66a5e0f4f89ec3ddd1d9a80
-->