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