11. Write a function, as efficiently as possible, to remove the file's extension from a standard URL

//First list the URLs that need to be manipulated
     $url _path = "http://www.sina.com.cn/abc/de/fg.php?id=1";
     method One:
    //Take out extension and parameters
     $temp = PathInfo ($ Url_path,pathinfo_extension);
    //Find extension
     $temp = Explode ("?", $temp)
      echo $temp [0];
    //Method Two:
    //decomposes the URL path, removing only the information after the directory
     $temp = Parse_url ($url _path);
     $path = $temp [' path '];
    //Then borrow PathInfo to remove the extension directly
     echo pathinfo ($path, Patainfo_ EXTENSION);
    //Method Three:
    //Remove file name directly
     $temp = PathInfo ($url _path,pathinfo_basename);
    //Remove extension
     $temp = Explode (".", $temp)
      echo $temp [0];

11. Write a function that extracts the file's extension from a standard URL as efficiently as possible