lib/Minify/Cache/File.php
public function isValid($id, $srcMtime)
    {
        $file = $this->path . '/' . $id;

        return (is_file($file) && (filemtime($file) >= $srcMtime));
    }
public function isValid($id, $srcMtime)
    {
        $file = $this->path . '/' . $id;

        return (is_file($file) && (filemtime($file) >= $srcMtime));
    }
public function isValid ( $ id , $ srcMtime ) { $ file = $ this -> path . '/' . $ id ; return ( is_file ( $ file ) && ( filemtime ( $ file ) >= $ srcMtime ) ) ; }
Does a valid cache entry exist?

@param string $id cache id (e.g. a filename)

@param int $srcMtime mtime of the original source file(s)

@return bool exists
Does a valid cache entry exist?