3v4l.org

run code in 300+ PHP versions simultaneously
<?php $y = ['2014','2015','2016','2017','2018','2019','2020']; for($i = 0, $c = count($y); $i < $c; $i++) //var_dump($i,$y[$i]); echo $i; echo $y[$i]; ?>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
0123456 Warning: Undefined array key 7 in /in/eNbQB on line 14
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
0123456 Notice: Undefined offset: 7 in /in/eNbQB on line 14
Output for 7.3.32 - 7.3.33
0123456

preferences:
158.88 ms | 401 KiB | 179 Q