推荐函数:
一是PHP获取当前页面的网址： dedecms也是用的这个

//获得当前的脚本网址 
function GetCurUrl() 
{
  if(!empty($_SERVER["REQUEST_URI"])) 
  {
    $scriptName = $_SERVER["REQUEST_URI"];
    $nowurl = $scriptName;
  } else 
  {
    $scriptName = $_SERVER["PHP_SELF"];
    if(empty($_SERVER["QUERY_STRING"])) 
    {
      $nowurl = $scriptName;
    } else 
    {
      $nowurl = $scriptName."?".$_SERVER["QUERY_STRING"];
    }
  }
  return $nowurl;
}

方法一：

<?php 
$url=$HTTP_SERVER_VARS["REQUEST_URI"]; 
echo(str_replace("/","",$url)); 
?> 

方法二：

<?php 
$url = $_SERVER["PHP_SELF"]; 
$filename= substr( $url , strrpos($url , ‘/")+1 ); 
echo $filename; 
?> 

方法三：

<?php 
$url = $_SERVER["PHP_SELF"]; 
$arr = explode( "/" , $url ); 
$filename= $arr[count($arr)-1]; 
echo $filename; 
?>

 方法四：

<?php 
$url = $_SERVER["PHP_SELF"]; 
$filename = end(explode("/",$url)); 
echo $filename; 
?>