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;
}
?>