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run code in 200+ php & hhvm versions
Bugs & Features
<?php $array = [ [ 'name' => 'Foo', 'children' => [ [ 'name' => 'B', 'children' => [] ], [ 'name' => 'A', 'children' => [] ] ] ], [ 'name' => 'Bar', 'children' => [ [ 'name' => 'Z', 'children' => [] ], [ 'name' => 'X', 'children' => [] ], [ 'name' => 'Y', 'children' => [] ] ] ] ]; array_usort($array, $f = function(&$x, &$y) use (&$f){ array_usort($x['children'], $f); array_usort($y['children'], $f); return strcasecmp($x['name'], $y['name']); }); var_dump($array);
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function array_usort() in /in/55FF6:36 Stack trace: #0 {main} thrown in /in/55FF6 on line 36
Process exited with code 255.
Output for 5.4.11 - 5.6.28
Fatal error: Call to undefined function array_usort() in /in/55FF6 on line 36
Process exited with code 255.
Output for 5.3.21 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/55FF6 on line 3
Process exited with code 255.