3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(); $a[] = 1; $a[] = 2; $a[] = 3; unset($a[1]); usort($a); var_dump($a);
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
Fatal error: Uncaught ArgumentCountError: usort() expects exactly 2 arguments, 1 given in /in/Co3h5:7 Stack trace: #0 /in/Co3h5(7): usort(Array) #1 {main} thrown in /in/Co3h5 on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: usort() expects exactly 2 parameters, 1 given in /in/Co3h5 on line 7 array(2) { [0]=> int(1) [2]=> int(3) }
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
Warning: Wrong parameter count for usort() in /in/Co3h5 on line 7 array(2) { [0]=> int(1) [2]=> int(3) }

preferences:
286.54 ms | 402 KiB | 460 Q