Pony.fm/app/Library/AudioCache.php

<?php

/**
 * Pony.fm - A community for pony fan music.
 * Copyright (C) 2015 Peter Deltchev
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

class AudioCache
{
    private static $_movieCache = [];

    public static function get(string $filename):FFmpegMovie
    {
        if (isset(self::$_movieCache[$filename])) {
            return self::$_movieCache[$filename];
        }

        return self::$_movieCache[$filename] = new FFmpegMovie($filename);
    }
}