Neos\Cache\Backend\SimpleFileBackend::set PHP Method

    public function set($entryIdentifier, $data, array $tags = [], $lifetime = null)
    {
        if (!is_string($data)) {
            throw new InvalidDataException('The specified data is of type "' . gettype($data) . '" but a string is expected.', 1334756734);
        }
        if ($entryIdentifier !== basename($entryIdentifier)) {
            throw new \InvalidArgumentException('The specified entry identifier must not contain a path segment.', 1334756735);
        }
        if ($entryIdentifier === '') {
            throw new \InvalidArgumentException('The specified entry identifier must not be empty.', 1334756736);
        }
        $cacheEntryPathAndFilename = $this->cacheDirectory . $entryIdentifier . $this->cacheEntryFileExtension;
        $result = $this->writeCacheFile($cacheEntryPathAndFilename, $data);
        if ($result !== false) {
            if ($this->cacheEntryFileExtension === '.php') {
                OpcodeCacheHelper::clearAllActive($cacheEntryPathAndFilename);
            }
            return;
        }
        $this->throwExceptionIfPathExceedsMaximumLength($cacheEntryPathAndFilename);
        throw new Exception('The cache file "' . $cacheEntryPathAndFilename . '" could not be written.', 1334756737);
    }