php自定义扩展名获取函数

<?php
$url = "http://www.abc.com/abc/de/fg.php?id=1";
//这个是自己写的
function getUrl($url) {
  $date = explode(&#39;?&#39;, $url);
  $date = basename($date[0]);
  $date = explode(&#39;.&#39;, $date);
  return $date[1];
}
var_dump(getUrl($url));
//下面两个是网上弄的
function getExt($url){
  $arr = parse_url($url);
  $file = basename($arr[&#39;path&#39;]);
  $ext = explode(".",$file);
  return $ext[1];
}
var_dump(getExt($url));
function getName($url) {
  $w_param = pathinfo($url);
  $str = $w_param[&#39;extension&#39;];
  list($type, $vars) = explode(&#39;?&#39;,$str);
  return $type;
}
echo &#39;start3&#39;.date("Y-m-d H:i:s");