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<?php function is_vowel($c){ return preg_match('/[ayeiou]/i', $c); }; function reverse_vowels($word) { $chars = str_split($word); preg_match_all('/[ayeiou]/i', $word, $matches); $vowels = $matches[0]; foreach($chars as $i=>$c) { if (in_array($word[$i], $vowels)) { $word[$i] = array_pop($vowels); } } return $word; } echo reverse_vowels('environment');
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