php 获取网站地址的函数代码

<?php
/**
* 取得网站的完整地址
* by www.jb200.com
*/
function getRootUrl(){
  $name = '';
  if ( isset($_SERVER['HTTP_HOST']) ){
    $name = $_SERVER['HTTP_HOST'];
  }else{
    $name = $_SERVER['SERVER_NAME'];
  }
  if ( strpos($name,':') === false && $_SERVER['SERVER_PORT'] != 80 ){
    $name .= ':'.$_SERVER['SERVER_PORT'];
  }
  $path = $_SERVER['PHP_SELF'];
  $path = substr($path,0,strrpos($path,'/')+1);

  return 'http://'.$name . $path;
}