<?php $strings = [ 'hello', 'leetcode', 'atwood' ]; foreach ($strings as &$string) { $count = preg_match_all('~[aeiou]~', $string, $m, PREG_OFFSET_CAPTURE); for ($i = 1; $i <= $count; ++$i) { $string[$m[0][$count - $i][1]] = $m[0][$i - 1][0]; } } var_export($strings);
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