php 访问控制

 <?php// An array of allowed users and their passwords$users = array( 'harryf' => 'secret', 'tom' => 'mypwd');// If there's no Authentication header, exitif (!isset($_SERVER['PHP_AUTH_USER'])) { header('HTTP/1.1 401 Unauthorized'); header('WWW-Authenticate: Basic realm="PHP Secured"'); exit('This page requires authentication');}// If the user name doesn't exist, exitif (!isset($users[$_SERVER['PHP_AUTH_USER']])) { header('HTTP/1.1 401 Unauthorized'); header('WWW-Authenticate: Basic realm="PHP Secured"'); exit('Unauthorized!');}// Is the password doesn't match the username, exitif ($users[$_SERVER['PHP_AUTH_USER']] != $_SERVER['PHP_AUTH_PW']){ header('HTTP/1.1 401 Unauthorized'); header('WWW-Authenticate: Basic realm="PHP Secured"'); exit('Unauthorized!');}echo 'You/'re in!';?>