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<?php class A { public function clean(array &$c) { foreach ($c as $key => &$val) { $val .= 'shiznit-'; } } } $arr = array('franz', 'cheryl'); $a = new A; $a->clean($arr); var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(13) "franzshiznit-" [1]=> string(14) "cherylshiznit-" }

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