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<?php $test = array(5 => "bar", 6 => "baz"); function testCallback($item, $arg = false) { return $item; } var_dump( array_map("testCallback", $test), array_map("testCallback", $test, array(true)) );
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [5]=> string(3) "bar" [6]=> string(3) "baz" } array(2) { [0]=> string(3) "bar" [1]=> string(3) "baz" }

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247.41 ms | 406 KiB | 400 Q