3v4l.org

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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>"; }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
systematic<br>mysterious<br>

preferences:
226.92 ms | 405 KiB | 312 Q