<?php function revert($str) { $obtainStrList = explode(' ', $str); $revertStr = ''; foreach ($obtainStrList as $obtainStr) { $revertStr .= ' '; for ($i = 1; $i < mb_strlen($obtainStr) + 1; $i++) { $revertStr .= mb_substr($obtainStr, -$i, 1); } } return $revertStr; } echo revert('Delivery Club, ZakaZaka');
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