private function _assetVersion($path)
    {

        $full_path = $this->_assetFullpath($path);

        $file_path = public_path($full_path);

        if (file_exists($file_path)) {
            return filemtime($file_path);
        }

        return null;
    }
private function _assetVersion($path)
    {

        $full_path = $this->_assetFullpath($path);

        $file_path = public_path($full_path);

        if (file_exists($file_path)) {
            return filemtime($file_path);
        }

        return null;
    }
private function _assetVersion ( $ path ) { $ full_path = $ this -> _assetFullpath ( $ path ) ; $ file_path = public_path ( $ full_path ) ; if ( file_exists ( $ file_path ) ) { return filemtime ( $ file_path ) ; } return null ; }
Return filemtime of given asset or null if asset doesn't exists

@param $path
@return int|null
Return filemtime of given asset or null if asset doesn t exists