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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 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [5]=> string(3) "bar" [6]=> string(3) "baz" } array(2) { [0]=> string(3) "bar" [1]=> string(3) "baz" }