php 去掉url中的某个参数的函数

在php中去掉url中的某个参数，的函数如下：

function removeqsvar($url, $var_names) {
    foreach($var_names as $param){
      $url = preg_replace('/([?&])'.$param.'=[^&]+(&|$)/','$1',$url);
    }
    $url = trim($url,"?");
    $url = trim($url,"#");
    $url = trim($url,"&");
    $url = trim($url,"/");
    return $url;
  }