3v4l.org

run code in 300+ PHP versions simultaneously
<?php $dow = array("mon","tue","wed","thu","fri","sat","sun"); $pick_a_day = 1; foreach($dow as $inc => $an_element ) { echo $dow[($pick_a_day+(count($dow))) % (count($dow))-1]." ".$pick_a_day."\n"; $pick_a_day++; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
mon 1 tue 2 wed 3 thu 4 fri 5 sat 6 Warning: Undefined array key -1 in /in/2o5TG on line 10 7
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
mon 1 tue 2 wed 3 thu 4 fri 5 sat 6 Notice: Undefined offset: -1 in /in/2o5TG on line 10 7
Output for 7.3.32 - 7.3.33
mon 1 tue 2 wed 3 thu 4 fri 5 sat 6 7
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
mon 1 tue 2 wed 3 thu 4 fri 5 sat 6 Notice: Undefined offset: -1 in /in/2o5TG on line 10 7

preferences:
163.76 ms | 402 KiB | 352 Q