函数定义：
//url信息处理函数
//定义处理函数
function get_url_msg($str){
$data = array();
$parameter = explode('&',end(explode('?',$str)));
foreach($parameter as $val){
$tmp = explode('=',$val);
$data[$tmp[0]] = $tmp[1];
}
return $data;
}函数使用：$url = 'https://api.weixin.qq.com/cgi-bin/message/mass/preview?access_token='.$access_token;
$data = $this->get_url_msg($url);
echo $data['access_token']; 