代码

我已经创建了一个PHP类与Instagram的API通信。我正在使用一个名为api_request的私人函数(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()
);

每当我请求下一页时，使用以下函数:

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。知道问题出在哪里吗?

Update # 1

我意识到，因为我的setup_data函数(在api_request函数中使用)将我的照片对象推到我的$this->data["photos"]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 );
    }
}

…当请求一个新页面时，必须创建一个空数组:

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;
}

我能够检索第二页，但所有随后的pagination_query调用只返回第二页。你知道有什么问题吗?

更新# 2

我发现使用while语句，使api_request函数调用本身，允许我检索一页又一页很好:

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,
                "content-type" => "application/json"
            )
        )
    );
    try {
        $response = json_decode( $body, 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;
    }
}

然而，这并没有修复我的pagination_query函数，它看起来好像我的try-catch块正在创建一个闭包，我真的不知道该怎么做。

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

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

$this->api_request( $this->data["pagination"] );

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

while ( count( $this->data["photos"] ) < 160 ) {
    $this-> api_request( $this->data["next_page"] );
}