3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function cmp($a, $b) { if ($a == $b) { return 0; } echo "a".$a."b".$b."\n"; return ($a > $b) ? -1 : 1; } $a = array(3, 2, 5, 6, 1); usort($a, "cmp"); foreach ($a as $key => $value) { echo "$key: $value\n"; } $b = $a; sort($b); echo "B:\n"; foreach ($a as $key => $value) { echo "$key: $value\n"; }
based on rMsTQ
Output for hhvm-3.15.4, 7.0.0 - 7.3.0rc3
a3b2 a2b5 a3b5 a2b6 a3b6 a5b6 a2b1 0: 6 1: 5 2: 3 3: 2 4: 1 B: 0: 6 1: 5 2: 3 3: 2 4: 1
Output for 5.6.0 - 5.6.30
a5b2 a1b5 a6b5 a3b5 a2b3 a1b2 0: 6 1: 5 2: 3 3: 2 4: 1 B: 0: 6 1: 5 2: 3 3: 2 4: 1