<?php

$url = 'http://p...content-available-to-author-only...a.org/wiki/ASP_World_Tour&sa=U&ei=yS6WVOvAA9HLsAShkYGoCw&ved=0CBQQFjAB&usg=AFQjCNFbV5WzVcG-aJbrvGdhbxz3wnPUKg';

echo $url = preg_replace('/\&.*/', '', $url);