<?php $result = 'вы ещё дома? давайте выходите!вам пришел ваш конверт!!!1'; $wordsArr = [ "вы", "вам", "ваш", "вас" ]; foreach($wordsArr as $word) { $result = preg_replace('/\b' . $word . '\b/u', mb_convert_case($word, MB_CASE_TITLE), $result); } echo $result;
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