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<?php var_dump(array_map('strval', array(3 => 1, 4 => 2))); var_dump(array_map('strval', array('3' => 1, '4' => 2)));
Output for 4.3.0 - 7.1.0
array(2) { [3]=> string(1) "1" [4]=> string(1) "2" } array(2) { [3]=> string(1) "1" [4]=> string(1) "2" }