How to use getID3?

[tfe]

I just installed getid3 on my Debian server:

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apt-get install php-getid3

What's next? How can I use it on my website?

I have read in some forums that I can use it this way:

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require_once('getid3/getid3.php');
$getID3 = new getID3;
 $path = 'sample.mp3';
$mixinfo = $getID3->analyze( $path );

But I don't know where is located getid3/getid3.php to require it. Should I copy this file to my website's directory or what? I don't understand anything.

Thanks.