php – 为什么Instagram的分页一遍又一遍地返回相同的页面？

我创建了一个PHP类与Instagram的API进行通信.我正在使用一个名为api_request的私有函数(如下所示)与Instagram的API进行通信：

private function api_request( $request = null ) {

    if ( is_null( $request ) ) {
        $request = $this->request["httpRequest"];
    }
    $body = wp_remote_retrieve_body( wp_remote_get( $request,array(
                "timeout" => 10,"content-type" => "application/json"
            )
        )
    );

    try {
        $response = json_decode( $body,true );
        $this->data["pagination"] = $response["pagination"]["next_url"];
        $this->data["response"] = $response["data"];

        $this->setup_data( $this->data );

    } catch ( Exception $ex ) {
        $this->data = null;
    }
}

这两行代码…

$this->data["pagination"] = $response["pagination"]["next_url"];
$this->data["response"] = $response["data"];

…在这个数组中设置我的数据：

private $data = array (
    "response"      => null,"pagination"    => null,"photos"        => array()
);

问题

每当我请求下一页,具有以下功能：

public function pagination_query() {
    $this->api_request( $this->data["pagination"] );
    $output = json_encode( $this->data["photos"] );

    return $output;
}

Instagram给了我第一页,一遍又一遍的收获.
任何想法这里有什么问题？

更新#1

我意识到,因为我的setup_data函数(在api_request函数中使用)将我的照片对象推送到我的$this-> data [“照片”]数组的末尾：

private function setup_data( $data ) {

    foreach ( $data["response"] as $obj ) {

        /* code that parses the api,goes here */


        /* pushes new object onto photo stack */
        array_push( $this->data["photos"],$new_obj );
    }
}

…在请求新页面时需要创建一个空数组：

public function pagination_query() {

    $this->data["photos"] = array(); // kicks out old photo objects

    $this->api_request( $this->data["pagination"] );
    $output = json_encode( $this->data["photos"] );

    return $output;
}

我可以检索第二页,但所有后续的pagination_query调用只返回第二页.任何想法可能是错的？

更新#2

我发现使用while语句,使api_request函数调用自身,允许我检索页面后页面很好：

private function api_request( $request = null ) {

    if ( is_null( $request ) ) {
        $request = $this->request["httpRequest"];
    }

    $body = wp_remote_retrieve_body( wp_remote_get( $request,array(
                "timeout" => 18,true );

        $this->data["response"] = $response["data"];
        $this->data["next_page"] = $response["pagination"]["next_url"];

        $this->setup_data( $this->data );

        // while state returns page after page just fine
        while ( count( $this->data["photos"] ) < 80 ) {
            $this-> api_request( $this->data["next_page"] );
        }

    } catch ( Exception $ex ) {
        $this->data = null;
    }
}

但是,这并不能修复我的pagination_query函数,而且似乎我的try-catch块正在创建一个闭包,而且我并不确定该做什么.