php $_SERVER["REQUEST_URI"]获取值的通用解决方法

<?php 
// 说明：获取 _SERVER['REQUEST_URI'] 值的通用解决方案 
function request_uri() 
{ 
if (isset($_SERVER['REQUEST_URI'])) 
{ 
$uri = $_SERVER['REQUEST_URI']; 
} 
else 
{ 
if (isset($_SERVER['argv'])) 
{ 
$uri = $_SERVER['PHP_SELF'] .'?'. $_SERVER['argv'][0]; 
} 
else 
{ 
$uri = $_SERVER['PHP_SELF'] .'?'. $_SERVER['QUERY_STRING']; 
} 
} 
return $uri; 
} 
?>