(PHP 5 >= 5.3.0, PHP 7, PECL phar >= 1.0.0)
PharFileInfo::isCompressedBZIP2 — Returns whether the entry is compressed using bzip2
public bool PharFileInfo::isCompressedBZIP2 ( void )
Note:
This method has been removed from the phar extension as of version 2.0.0. Alternative implementations are available using PharFileInfo::isCompressed(), PharFileInfo::decompress(), and PharFileInfo::compress().
This returns whether a file is compressed within a Phar archive with Bzip2 compression.
 TRUE if the file is compressed within the Phar archive using Bzip2, FALSE if not. 
Example #1 A PharFileInfo::isCompressedBZIP2() example
<?php
try {
    $p = new Phar('/path/to/my.phar', 0, 'my.phar');
    $p['myfile.txt'] = 'hi';
    $p['myfile2.txt'] = 'hi';
    $p['myfile3.txt'] = 'hi';
    $p['myfile2.txt']->setCompressedGZ();
    $p['myfile3.txt']->setCompressedBZIP2();
    $file = $p['myfile.txt'];
    $file2 = $p['myfile2.txt'];
    $file3 = $p['myfile3.txt'];
    var_dump($file->isCompressedBZIP2());
    var_dump($file2->isCompressedBZIP2());
    var_dump($file3->isCompressedBZIP2());
} catch (Exception $e) {
    echo 'Create/modify on phar my.phar failed: ', $e;
}
?> The above example will output:
bool(false) bool(false) bool(true)
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    https://secure.php.net/manual/en/pharfileinfo.iscompressedbzip2.php