(PHP >= 5.3.0, PECL phar >= 2.0.0)
Phar::isFileFormat — Returns true if the phar archive is based on the tar/phar/zip file format depending on the parameter
Either Phar::PHAR, Phar::TAR, or Phar::ZIP to test for the format of the archive.
Returns TRUE if the phar archive matches the file format requested by the parameter
PharException is thrown if the parameter is an unknown file format specifier.