guard_clauses_01.php

<?php
/**
*  Unlock a specific type of order. Unusually unlock after the confirm has been completed
*
* @param  int $orderId Id of the object you unlock
* @return bool            True on success
* @throws LockException
* @throws \Exception
*/
public function unlock($orderId, $userId)
{
    $redis = $this->app['cache'];

    if (!empty($this->type) && !empty($orderId) && in_array($this->type, $this->availableType)) {
        $result = $redis->hGet(sprintf(self::REDIS_CACHE_TEMPORARY_LOCK, $this->type), $orderId);
        if (!empty($result)) {
            // lock if it's the same user who try to unlock
            $data = json_decode($result, true);
            if ($userId == $data['user']['id']) {
                $result = $redis->hDel(sprintf(self::REDIS_CACHE_TEMPORARY_LOCK, $this->type), $orderId);
                if ($result == true) {
                    return true;
                } else {
                    throw new LockException("Unlock failed. Please try again");
                }
            } else {
                throw new LockException("Unlock failed. You can't unlock something that isn't yours");
            }
        } else {
            throw new LockException("This order wasn't locked. Can't unlock");
        }
    } else {
        throw new LockException("Missing/Invalid parameters. Can't unlock for type: " . $this->type . " with id: " . $orderId);
    }
}