php服务器端怎么获取到用户聊天记录。

public function chatRecord($ql = '', $cursor = '', $limit = 20) { $ql = ! empty ( $ql ) ? "ql=" . $ql : "order+by+timestamp+desc"; $cursor = ! empty ( $cursor ) ? "&cursor=" . $cursor : ''; $url = $this->url . "chatmessages?" . $ql . "&limit=" . $limit . $cursor; $access_token = $this->token (); $header [] = 'Authorization: Bearer ' . $access_token; $result = $this->curl ( $url, '', $header, $type = "GET " ); echo $result; }
在网上看别人是这样写的，但不知道$ql的值是什么格式