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<?php $a = ["23",3,4]; array_walk($a, 'intval'); echo json_encode($a); $a = array_map('intval', $a); echo json_encode($a);
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.3.0rc3
["23",3,4][23,3,4]