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<?php $string = "Legend Of Zelda"; $array = array("to","of","at"); echo preg_replace_callback('~\b(?:' . implode("|", $array) . ')\b~ui', function ($m) { return mb_strtolower($m[0]); }, $string);
Output for git.master_jit, rfc.property-hooks, git.master
Legend of Zelda

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