PHP 取得目前網頁的對外網址

轉載自：Google API 1.7.7

<?php
  function getCurrentUrl() 
  {
    global $_SERVER;

    /**
      * Filter php_self to avoid a security vulnerability.
      */
    $php_request_uri = htmlentities(substr($_SERVER['REQUEST_URI'], 0, strcspn($_SERVER['REQUEST_URI'], "\n\r")), ENT_QUOTES);

    if (isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') {
      $protocol = 'https://';
    } else {
      $protocol = 'http://';
    }
    $host = $_SERVER['HTTP_HOST'];
    if ($_SERVER['SERVER_PORT'] != '' &&
        (($protocol == 'http://' && $_SERVER['SERVER_PORT'] != '80') ||
        ($protocol == 'https://' && $_SERVER['SERVER_PORT'] != '443'))) {
      $port = ':' . $_SERVER['SERVER_PORT'];
    } else {
      $port = '';
    }
    return $protocol . $host . $port . $php_request_uri;
  }
?>