3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [1, 2, 3, 4, 5]; for ($i = 5; $i >= 0; $i--) { echo $a[$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
Warning: Undefined array key 5 in /in/Kvu7m on line 5 54321
Output for 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 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined offset: 5 in /in/Kvu7m on line 5 54321
Output for 7.3.32 - 7.3.33, 7.4.26
54321

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131.61 ms | 401 KiB | 169 Q