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<?php $words = "systematic,gear,synthesis,mysterious"; $words=explode(",",$words); $your_array = preg_grep('~(?=[^s]*s)(?=[^m]*m)(?=[^e]*e)~', $words);; print_r(strpos($words, array('s', 'e', 'm'))); print_r($your_array);

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38.16 ms | 402 KiB | 5 Q