(PHP >= 5.3.0, PECL phar >= 1.2.0)
Phar::hasMetadata — Returns whether phar has global meta-data
Returns whether phar has global meta-data set.
No parameters.
   Returns TRUE if meta-data has been set, and FALSE if not.
  
Example #1 A Phar::hasMetadata() example
<?php
try {
    $phar = new Phar('myphar.phar');
    var_dump($phar->hasMetadata());
    $phar->setMetadata(array('thing' => 'hi'));
    var_dump($phar->hasMetadata());
    $phar->delMetadata();
    var_dump($phar->hasMetadata());
} catch (Exception $e) {
    // handle error
}
?>
The above example will output:
bool(false) bool(true) bool(false)