api.php

<?php

$query = $_GET['q'];

$bookmark = null;
if (array_key_exists("bookmark", $_GET)) {
    $bookmark = urldecode($_GET["bookmark"]);
}

$csrftoken = null;
if (array_key_exists("csrftoken", $_GET)) {
    $csrftoken = $_GET["csrftoken"];
}

$url = "https://www.pinterest.com/resource/BaseSearchResource/get/";

class SearchResult
{
    public $images;
    public $bookmark;
}

$header_function = function($ch, $rawheader)
{
    global $csrftoken;
    $len = strlen($rawheader);

    $header = explode(":", $rawheader, 2);
    if (count($header) != 2)
        return $len;

    // we are only interested in set-cookie header
    if (trim($header[0]) != "set-cookie")
        return $len;

    $cookie = explode(";", trim($header[1]), 2);
    $cookie = explode("=", $cookie[0], 2);

    switch ($cookie[0])
    {
        case "csrftoken":
            $csrftoken = $cookie[1];
    }

    return $len;
};

$prepare_search_curl_obj = function($query, $bookmark) use ($url, $header_function, $csrftoken)
{
    $data_param_obj = array(
        "options"=>array(
            "query"=>$query
        )
    );
    if ($bookmark != null)
        $data_param_obj["options"]["bookmarks"] = array($bookmark);

    $data_param = urlencode(json_encode($data_param_obj));

    $headers = array();
    if ($csrftoken != null)
    {
        $headers[] = "x-csrftoken: $csrftoken";
        $headers[] = "cookie: csrftoken=$csrftoken";
    }

    $finalurl = $url;
    if ($bookmark == null)
        $finalurl = "$url?data=$data_param";

    $ch = curl_init($finalurl);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADERFUNCTION, $header_function);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    if ($bookmark != null)
    {
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, "data=$data_param");
    }
    return $ch;
};

$search = function($query, $bookmark) use($prepare_search_curl_obj)
{
    $ch = $prepare_search_curl_obj($query, $bookmark);
    $response = curl_exec($ch);
    $data = json_decode($response);
    $images = array();
        foreach ($data->{"resource_response"}->{"data"}->{"results"} as $result)
        {
            $image = $result->{"images"}->{"orig"};
            $url = $image->{"url"};
            array_push($images, $url);
        }
    echo json_encode($images);
    $result = new SearchResult();
    $result->images = $images;
    if (property_exists($data->{"resource_response"}, "bookmark"))
        $result->bookmark = $data->{"resource_response"}->{"bookmark"};
    return $result;
};

$result = $search($query, $bookmark);

if ($result->bookmark != null)
{
    $query_encoded = urlencode($query);
    $bookmark_encoded = urlencode($result->bookmark);
    $csrftoken_encoded = urlencode($csrftoken);
    // echo "<h2 style=\"text-align: center;\"><a href=\"/search.php?q=$query_encoded&bookmark=$bookmark_encoded&csrftoken=$csrftoken_encoded\">Next page</a></h2><br><br><br>";
}

    header("Content-Type: application/json");

?>