Pony.fm/app/library/Gravatar.php

<?php

	use Illuminate\Support\Facades\Config;
	use Illuminate\Support\Facades\URL;

	class Gravatar {
		/**
		 * Returns a Gravatar URL
		 *
		 * @param string $email The email address
		 * @param string $s Size in pixels, defaults to 80px [ 1 - 2048 ]
		 * @param string $d Default imageset to use [ 404 | mm | identicon | monsterid | wavatar ]
		 * @param string $r Maximum rating (inclusive) [ g | pg | r | x ]
		 * @return Gravatar URL
		 * @source http://gravatar.com/site/implement/images/php/
		 */
		public static function getUrl( $email, $s = 80, $d = 'mm', $r = 'g') {
			$url = 'https://www.gravatar.com/avatar/';
			$url .= md5( strtolower( trim( $email ) ) );
			$url .= "?s=$s&r=$r";

			if (!Config::get('app.debug')) {
				$size = 'normal';
				if ($s == 50)
					$size = 'thumbnail';
				else if ($s == 100)
					$size = 'small';

				$url .= "&d=" . urlencode(URL::to('/images/icons/profile_' . $size . '.png'));
			}

			return $url;
		}
	}