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