3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array_fill(0, 4, NULL); $a[0]++; ++$a[1]; $a[2]--; --$a[3]; var_dump($a);
Output for 8.3.0 - 8.3.6
Warning: Decrement on type null has no effect, this will change in the next major version of PHP in /in/3uH4D on line 5 Warning: Decrement on type null has no effect, this will change in the next major version of PHP in /in/3uH4D on line 6 array(4) { [0]=> int(1) [1]=> int(1) [2]=> NULL [3]=> NULL }
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, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
array(4) { [0]=> int(1) [1]=> int(1) [2]=> NULL [3]=> NULL }

preferences:
288.71 ms | 405 KiB | 361 Q