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Converting WMA audio files to M4A (MPEG 4 Audio) or OGG in PHP using free API:

<?php
$url = 'http://server.com/sound.wma';
$data = json_decode(file_get_contents('http://api.rest7.com/v1/sound_convert.php?url=' . $url . '&format=ogg'));
//or:
//$data = json_decode(file_get_contents('http://api.rest7.com/v1/sound_convert.php?url=' . $url . '&format=m4a'));

if (@$data->success !== 1)
{
    die('Failed');
}
$song = file_get_contents($data->file);
file_put_contents('sound.ogg', $song);
//or:
//file_put_contents('sound.m4a', $song);