InstagramFeed

class InstagramFeed {

	protected $keys;

	public function __construct($user_id, $access_code)
	{
		$this->keys = [
			'user_id'     => $user_id,
			'access_code' => $access_code,
		];
	}

	public function getImages()
	{
		/**
		 * Check the WP Cache if the feed is there
		 * If it is, return that.
		 */
		$cache_name = 'Competitor_Instagram_feed';
		$cache = get_transient($cache_name);
		if ($cache) return $cache;

		/**
		 * If it's not cached, build it
		 */
		$images = $this->buildFeed();

		/**
		 * If it's a WP error, return the error
		 * Do this before saving the error in cache
		 */
		if ( is_wp_error($images) ) return $images;

		/**
		 * Cache the images for one hour
		 */
		set_transient($cache_name, $images, 1 * HOUR_IN_SECONDS);
		return $images;
	}

	private function buildFeed()
	{
		$feed = $this->getFeed();

		/**
		 * If feed is not got'n, put up an error.
		 */
		if ($feed === null) return new WP_Error(400, 'Could not connect to Instagram');

		$images = [];
		foreach ($feed->data as $image)
		{
			$images[] = $image->images;
		}
		return $images;
	}

	private function getFeed()
	{
		$url = "https://api.instagram.com/v1/users/{$this->keys['user_id']}/media/recent/?access_token={$this->keys['access_code']}";
		return json_decode($this->fetchData($url));
	}

	private function fetchData($url)
	{
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_TIMEOUT, 20);
		$result = curl_exec($ch);
		curl_close($ch);
		return $result;
	}

}