(PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL phar >= 1.0.0)
PharFileInfo::isCompressed — Returns whether the entry is compressed
$compression = null): boolThis returns whether a file is compressed within a Phar archive with either Gzip or Bzip2 compression.
compression
       One of Phar::GZ or Phar::BZ2,
       defaults to any compression.
      
   true if the file is compressed within the Phar archive, false if not.
  
| Version | Description | 
|---|---|
| 8.0.0 | compressionis now nullable. | 
Example #1 A PharFileInfo::isCompressed() example
<?php
try {
    $p = new Phar('/path/to/my.phar', 0, 'my.phar');
    $p['myfile.txt'] = 'hi';
    $p['myfile2.txt'] = 'hi';
    $p['myfile2.txt']->setCompressedGZ();
    $file = $p['myfile.txt'];
    $file2 = $p['myfile2.txt'];
    var_dump($file->isCompressed());
    var_dump($file2->isCompressed());
} catch (Exception $e) {
    echo 'Create/modify on phar my.phar failed: ', $e;
}
?>
The above example will output:
bool(false) bool(true)