3v4l.org

run code in 300+ PHP versions simultaneously
<?php $data = [ ['time_diff' => 178], ['time_diff' => 41], ['time_diff' => 83] ]; usort($data, function ($a, $b) { $a['date_diff'] < $b['date_diff']; }); print_r($data);

preferences:
46.26 ms | 402 KiB | 5 Q