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<?php function map(array $array, array $keys) { $filter = function ($branch) { return $branch; }; foreach ($keys as $key) { $filter = function ($branch) use ($filter, $key) { switch ($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 8.3.0 - 8.3.6
Warning: Undefined array key "a" in /in/LgU8U on line 19 Warning: Trying to access array offset on null in /in/LgU8U on line 19 Warning: Undefined array key "c" in /in/LgU8U on line 19 NULL
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Warning: Undefined array key "a" in /in/LgU8U on line 19 Warning: Trying to access array offset on value of type null in /in/LgU8U on line 19 Warning: Undefined array key "c" in /in/LgU8U on line 19 NULL
Output for 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined index: a in /in/LgU8U on line 19 Notice: Trying to access array offset on value of type null in /in/LgU8U on line 19 Notice: Undefined index: c in /in/LgU8U on line 19 NULL
Output for 7.3.32 - 7.3.33, 7.4.26
NULL
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31
Notice: Undefined index: a in /in/LgU8U on line 19 Notice: Undefined index: c in /in/LgU8U on line 19 NULL
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/LgU8U on line 19
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/LgU8U 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/LgU8U 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/LgU8U on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/LgU8U on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/LgU8U on line 3
Process exited with code 255.
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