PHP功能类[获取客户端IP、页面跳转]

<?php

/**
 * Miscellaneous utility methods.
 */
final class Utils {

      private function __construct() {
        
      }

      /**
       * Get IP address
       * @return string IP address string
       */
      public static function getIpAddress() {
            return $_SERVER["REMOTE_ADDR"];
      }

     /************************************************* 华丽的分割线 ************************************************/

     /**
      * Redirect to the given page.
      * @param type $page target page
      * @param array $params page parameters
      */
     public static function redirect($page, $sub_page = null, array $params = array()) {
        header('Location: ' . self::createLink($page, $sub_page, $params));
        die();
     }

     /**
      * Generate link.
      * @param string $page target page
      * @param array $params page parameters
      */
     public static function createLink($page, $sub_page = null, array $params = array()) {
        if ($sub_page) {
            $params = array_merge(array('sub_page' => $sub_page), $params);
        }
        if (!$page) {
            return "#";
        }
        $param_str = http_build_query($params);
        if (trim($param_str) == "") {
            return $page . '.php';
        } else {
            return $page . '.php?' . $param_str;
        }
     }




}


// Get IP Address.
$last_login_ip = Utils::getIpAddress();


// Redirect to the given page.
Utils::redirect('welcome');


?>