Description:
------------
---
From manual page: http://www.php.net/function.id3-get-version#refsect1-
function.id3-get-version-returnvalues
---

Pay attention to the package version between 1.0 and 2.0. More constants for 
version 2 of id3 tags are available.

Test script:
---------------
<?php
$version = id3_get_version( "path/to/example.mp3" );
if ($version & ID3_V2) {
    // something here
}
?>
With the package id3-0.2 an error is returned as:
PHP Notice:  Use of undefined constant ID3_V2 - assumed 'ID3_V2'.

See constants defined with get_defined_constants() as:
<?php
$id3_constants=get_defined_constants(true);
print_r($id3_constants["id3"]);
?>
You have constants ID3_V2_1, ID3_V2_2 , etc