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<?php $arr = array("stringkey" => "value"); function cb1($a) { return array ($a); } function cb2($a, $b) { return array ($a, $b); } var_dump(array_map("cb1", $arr)); var_dump(array_map("cb2", $arr, $arr)); var_dump(array_map(null, $arr)); var_dump(array_map(null, $arr, $arr));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["stringkey"]=> array(1) { [0]=> string(5) "value" } } array(1) { [0]=> array(2) { [0]=> string(5) "value" [1]=> string(5) "value" } } array(1) { ["stringkey"]=> string(5) "value" } array(1) { [0]=> array(2) { [0]=> string(5) "value" [1]=> string(5) "value" } }