Possible Duplicate:
PHP Function to get MP3 duration
I’ve currently got the following code for getting the video duration
$file = "videos/the_video.mp4";
passthru("ffmpeg -i ".$file." 2>&1");
$duration = ob_get_contents();
$search='/Duration: (.*?)[.]/';
$duration=preg_match($search, $duration, $matches, PREG_OFFSET_CAPTURE);
$duration = $matches[1][0];
How would I do this using a MP3 ?
If you want a solution without ffmpeg, you could use getID3:
http://getid3.sourceforge.net/
Source sample found here:
http://www.talkphp.com/general/2600-php-get-mp3-song-length.html