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<?php $colors = array('red', 'blue', 'green', 'yellow'); foreach ($colors as &$color) { strtoupper($color); } var_dump($colors);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(3) "red" [1]=> string(4) "blue" [2]=> string(5) "green" [3]=> &string(6) "yellow" }

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