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<?php $words = array('systematic', 'سلام','gear','synthesis','mysterious'); $letters=array('s','m', 'e'); foreach ($words as $w) { //print "lets check word $w<br>"; $n=0; foreach ($letters as $l) { if (strpos($w, $l)!==false) $n++; } if ($n>=3) print "$w<br>"; }

preferences:
33.01 ms | 402 KiB | 5 Q