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<?php $s = array('a', 'b', 'c'); $s = array_map('strtoupper', $s); var_dump($s);
based on fjKb4
Output for 4.3.0 - 7.2.0
array(3) { [0]=> string(1) "A" [1]=> string(1) "B" [2]=> string(1) "C" }