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run code in 150+ php & hhvm versions
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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 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
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" } } } Notice: Undefined index: c in /in/7O3Eh on line 20 Notice: Undefined index: b in /in/7O3Eh on line 20 NULL
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/7O3Eh on line 20
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/7O3Eh on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/7O3Eh on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/7O3Eh on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/7O3Eh on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/7O3Eh on line 3
Process exited with code 255.