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<?php $array = [ [ 'name' => 'Foo', 'children' => [ [ 'name' => 'B', 'children' => [] ], [ 'name' => 'A', 'children' => [] ] ] ], [ 'name' => 'Bar', 'children' => [ [ 'name' => 'Z', 'children' => [] ], [ 'name' => 'X', 'children' => [] ], [ 'name' => 'Y', 'children' => [] ] ] ] ]; $name = null; usort($array, $f = function(&$x, &$y) use (&$f, &$name){ $myName = $name; $name = $x['name']; usort($x['children'], $f); $name = $y['name']; usort($y['children'], $f); var_dump($myName, $x['children']); return strcasecmp($x['name'], $y['name']); }); var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #1 ($x) must be passed by reference, value given in /in/RWnG1 on line 38 Warning: {closure}(): Argument #2 ($y) must be passed by reference, value given in /in/RWnG1 on line 38 Warning: {closure}(): Argument #1 ($x) must be passed by reference, value given in /in/RWnG1 on line 42 Warning: {closure}(): Argument #2 ($y) must be passed by reference, value given in /in/RWnG1 on line 42 string(3) "Foo" array(0) { } Warning: {closure}(): Argument #1 ($x) must be passed by reference, value given in /in/RWnG1 on line 44 Warning: {closure}(): Argument #2 ($y) must be passed by reference, value given in /in/RWnG1 on line 44 string(3) "Bar" array(0) { } Warning: {closure}(): Argument #1 ($x) must be passed by reference, value given in /in/RWnG1 on line 44 Warning: {closure}(): Argument #2 ($y) must be passed by reference, value given in /in/RWnG1 on line 44 string(1) "X" array(0) { } Warning: {closure}(): Argument #1 ($x) must be passed by reference, value given in /in/RWnG1 on line 44 Warning: {closure}(): Argument #2 ($y) must be passed by reference, value given in /in/RWnG1 on line 44 string(1) "X" array(0) { } NULL array(2) { [0]=> array(2) { ["name"]=> string(1) "A" ["children"]=> array(0) { } } [1]=> array(2) { ["name"]=> string(1) "B" ["children"]=> array(0) { } } } array(2) { [0]=> array(2) { ["name"]=> string(3) "Bar" ["children"]=> array(3) { [0]=> array(2) { ["name"]=> string(1) "Z" ["children"]=> array(0) { } } [1]=> array(2) { ["name"]=> string(1) "X" ["children"]=> array(0) { } } [2]=> array(2) { ["name"]=> string(1) "Y" ["children"]=> array(0) { } } } } [1]=> array(2) { ["name"]=> string(3) "Foo" ["children"]=> array(2) { [0]=> array(2) { ["name"]=> string(1) "B" ["children"]=> array(0) { } } [1]=> array(2) { ["name"]=> string(1) "A" ["children"]=> array(0) { } } } } }

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