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<?php $str = 'moooo zeee'; $words = explode(' ', $str); foreach($words as $key => $word) { foreach(str_split($word) as $index => $char) { $thisOrd = ord($char); if ($index > 0 AND $thisOrd !== $lastOrd + 1) { unset($words[$key]); break; } $lastOrd = $thisOrd; } } echo implode(' ', $words);

preferences:
38.76 ms | 402 KiB | 5 Q