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<?php function map(array $array, array $keys) { $filter = function ($branch) { return $branch; }; foreach (array_reverse($keys) as $key) { $filter = function ($branch) use ($filter, $key) { var_dump($key, $branch); switch ($key) { case '*': case '?': return array_map(function ($dimension) use ($filter) { return $filter($dimension); }, $branch); default: return $filter($branch)[$key]; } }; } return $filter($array); } $array = [ 'a' => [ 'b' => [ [ 'c' => 'foo', ], [ 'c' => 'bar', ], [ 'c' => 'qux', ], ], ], ]; $keys = ['a', 'b', '*', 'c']; var_dump(map($array, $keys));
Output for git.master, git.master_jit
string(1) "a" array(1) { ["a"]=> array(1) { ["b"]=> array(3) { [0]=> array(1) { ["c"]=> string(3) "foo" } [1]=> array(1) { ["c"]=> string(3) "bar" } [2]=> array(1) { ["c"]=> string(3) "qux" } } } } string(1) "b" array(1) { ["a"]=> array(1) { ["b"]=> array(3) { [0]=> array(1) { ["c"]=> string(3) "foo" } [1]=> array(1) { ["c"]=> string(3) "bar" } [2]=> array(1) { ["c"]=> string(3) "qux" } } } } string(1) "*" array(1) { ["a"]=> array(1) { ["b"]=> array(3) { [0]=> array(1) { ["c"]=> string(3) "foo" } [1]=> array(1) { ["c"]=> string(3) "bar" } [2]=> array(1) { ["c"]=> string(3) "qux" } } } } string(1) "c" array(1) { ["b"]=> array(3) { [0]=> array(1) { ["c"]=> string(3) "foo" } [1]=> array(1) { ["c"]=> string(3) "bar" } [2]=> array(1) { ["c"]=> string(3) "qux" } } } Warning: Undefined array key "c" in /in/7O3Eh on line 20 Warning: Undefined array key "b" in /in/7O3Eh on line 20 Warning: Trying to access array offset on value of type null in /in/7O3Eh on line 20 NULL
Output for rfc.property-hooks
string(1) "a" array(1) { ["a"]=> array(1) { ["b"]=> array(3) { [0]=> array(1) { ["c"]=> string(3) "foo" } [1]=> array(1) { ["c"]=> string(3) "bar" } [2]=> array(1) { ["c"]=> string(3) "qux" } } } } string(1) "b" array(1) { ["a"]=> array(1) { ["b"]=> array(3) { [0]=> array(1) { ["c"]=> string(3) "foo" } [1]=> array(1) { ["c"]=> string(3) "bar" } [2]=> array(1) { ["c"]=> string(3) "qux" } } } } string(1) "*" array(1) { ["a"]=> array(1) { ["b"]=> array(3) { [0]=> array(1) { ["c"]=> string(3) "foo" } [1]=> array(1) { ["c"]=> string(3) "bar" } [2]=> array(1) { ["c"]=> string(3) "qux" } } } } string(1) "c" array(1) { ["b"]=> array(3) { [0]=> array(1) { ["c"]=> string(3) "foo" } [1]=> array(1) { ["c"]=> string(3) "bar" } [2]=> array(1) { ["c"]=> string(3) "qux" } } } Warning: Undefined array key "c" in /in/7O3Eh on line 20 Warning: Undefined array key "b" in /in/7O3Eh on line 20 Warning: Trying to access array offset on null in /in/7O3Eh on line 20 NULL

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