Erant-OldApp/public/api/routes/game/details.php

<?php

function remoteFileExists($url) {
	$curl = curl_init($url);

	//don't fetch the actual page, you only want to check the connection is ok
	curl_setopt($curl, CURLOPT_NOBODY, true);

	//do request
	$result = curl_exec($curl);

	$ret = false;

	//if request did not fail
	if ($result !== false) {
		//if request was ok, check response code
		$statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);  

		if ($statusCode == 200) {
			$ret = true;   
		}
	}

	curl_close($curl);

	return $ret;
}

return function($data, $headers, $db) {
	$imagesHostName = 'https://geohry.skolazdola.cz/';

	if(!isset($data['gameurl']) || empty($data['gameurl'])) return [
		"success" => false,
		"data" => [
			"message" => "Property 'gameurl' is not set."
		]
	];

	$gameUrl = $data['gameurl'];

	$gameDetails = $db->select('games4', '*', [
		'url' => $gameUrl
	]);

	if(!$gameDetails) return [
		"success" => false,
		"data" => [
			"message" => "Invalid 'gameurl'."
		]
	];

	$gameDetails = $gameDetails[0];

	$gameDetails["questions"] = $db->select('questions4', '*', [
		'url' => $gameUrl
	]);

	$thumbnailPath = "{$imagesHostName}/games/{$gameUrl}/intro.jpg";
	$gameDetails["thumbnail"] = remoteFileExists($thumbnailPath) ? $thumbnailPath : null;

	foreach($gameDetails["questions"] as &$question) {
		$questionThumbnailPath = "{$imagesHostName}/games/{$gameUrl}/" . $question["uniqid"] . ".jpg";
		$question["thumbnail"] = remoteFileExists($questionThumbnailPath) ? $questionThumbnailPath : null;
	}

	return [
		"success" => true,
		"data" => $gameDetails
	];
};