3v4l.org

run code in 500+ PHP versions simultaneously
<?php $slot_count = 5; $start = strtotime("08:00"); echo date("H:i:s", $start).'<br/>'; for( $i=0; $i<$slot_count; $i++ ) { $start = $start; $end_new = date("H:i:s", strtotime('+20 minutes', $start)); $start = strtotime($end_new); echo $end_new.'<br/>'; }
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
08:00:00<br/>08:20:00<br/>08:40:00<br/>09:00:00<br/>09:20:00<br/>09:40:00<br/>

preferences:
73.34 ms | 1276 KiB | 4 Q