39     public function load(string $key): void  argument
41         if (is_file($key)) {
42             @include_once $key;
46     public function write(string $key, string $content): void  argument
48         $dir = \dirname($key);
60         $tmpFile = tempnam($dir, basename($key));
61         if (false !== @file_put_contents($tmpFile, $content) && @rename($tmpFile, $key)) {
62             @chmod($key, 0666 & ~umask());
67                     @opcache_invalidate($key, true);
69                     apc_compile_file($key);
76         throw new \RuntimeException(\sprintf('Failed to write cache file "%s".', $key));
81         $key = $this->generateKey($name, $cls);
82         if (!@unlink($key) && file_exists($key)) {
83             throw new \RuntimeException(\sprintf('Failed to delete cache file "%s".', $key));
87     public function getTimestamp(string $key): int  argument
89         if (!is_file($key)) {
93         return (int) @filemtime($key);