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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) { if (!isset($a[$x])) { throw new Exception("Key X ('{$x}') not found."); } else {var_dump($x, $a[$x]);} if (!isset($a[$y])) { throw new Exception("Key Y ('{$y}') not found."); } return $x < $y; });
based on US4ks
Output for 7.0.6 - 7.2.0
string(8) "foo-test" array(1) { [0]=> int(1) } string(1) "-" array(1) { [0]=> int(2) } string(8) "foo-test" array(1) { [0]=> int(1) }
Output for 7.0.0 - 7.0.5
string(8) "foo-test" array(1) { [0]=> int(1) } string(1) "-" array(1) { [0]=> int(2) } string(8) "foo-test" array(1) { [0]=> int(1) } Fatal error: Uncaught Exception: Key Y ('bar-test') not found. in /in/6323h:10 Stack trace: #0 [internal function]: {closure}('foo-test', 'bar-test') #1 /in/6323h(14): uksort(Array, Object(Closure)) #2 {main} thrown in /in/6323h on line 10
Process exited with code 255.
Output for 5.4.11 - 5.6.28
string(1) "-" array(1) { [0]=> int(2) } string(8) "bar-test" array(1) { [0]=> int(3) } string(8) "foo-test" array(1) { [0]=> int(1) } Warning: uksort(): Array was modified by the user comparison function in /in/6323h on line 14
Output for 5.3.21 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/6323h on line 3
Process exited with code 255.