3v4l.org

run code in 200+ php & hhvm versions
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<?php $a = ['foo-test' => [1], '-' => [2], 'bar-test' => [3]]; uksort($a, function($x, $y) use (&$a) { var_dump($a); if (!isset($a[$x])) { throw new Exception("Key '{$x}' not found."); } if (!isset($a[$y])) { throw new Exception("Key '{$y}' not found."); } return $x < $y; });
based on FhqYD
Output for 7.0.6 - 7.2.0
array(3) { ["foo-test"]=> array(1) { [0]=> int(1) } ["-"]=> array(1) { [0]=> int(2) } ["bar-test"]=> array(1) { [0]=> int(3) } } array(3) { ["foo-test"]=> array(1) { [0]=> int(1) } ["-"]=> array(1) { [0]=> int(2) } ["bar-test"]=> array(1) { [0]=> int(3) } } array(3) { ["foo-test"]=> array(1) { [0]=> int(1) } ["-"]=> array(1) { [0]=> int(2) } ["bar-test"]=> array(1) { [0]=> int(3) } }
Output for 7.0.0 - 7.0.5
array(3) { ["foo-test"]=> array(1) { [0]=> int(1) } ["-"]=> array(1) { [0]=> int(2) } ["bar-test"]=> array(1) { [0]=> int(3) } } array(3) { ["foo-test"]=> array(1) { [0]=> int(1) } ["-"]=> array(1) { [0]=> int(2) } ["bar-test"]=> array(1) { [0]=> int(3) } } array(3) { ["foo-test"]=> array(1) { [0]=> int(1) } ["bar-test"]=> array(1) { [0]=> int(3) } ["-"]=> array(1) { [0]=> int(2) } } Fatal error: Uncaught Exception: Key 'bar-test' not found. in /in/ZKA13:11 Stack trace: #0 [internal function]: {closure}('foo-test', 'bar-test') #1 /in/ZKA13(15): uksort(Array, Object(Closure)) #2 {main} thrown in /in/ZKA13 on line 11
Process exited with code 255.
Output for 5.4.11 - 5.6.28
array(3) { ["foo-test"]=> array(1) { [0]=> int(1) } ["-"]=> array(1) { [0]=> int(2) } ["bar-test"]=> array(1) { [0]=> int(3) } } array(3) { ["foo-test"]=> array(1) { [0]=> int(1) } ["-"]=> array(1) { [0]=> int(2) } ["bar-test"]=> array(1) { [0]=> int(3) } } array(3) { ["foo-test"]=> array(1) { [0]=> int(1) } ["-"]=> array(1) { [0]=> int(2) } ["bar-test"]=> array(1) { [0]=> int(3) } } Warning: uksort(): Array was modified by the user comparison function in /in/ZKA13 on line 15
Output for 5.3.21 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/ZKA13 on line 3
Process exited with code 255.