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<?php $strselvaluelist = '4|17'; $i=0; if(!empty($strselvaluelist)){ while($i < strlen($strselvaluelist)){ if($strselvaluelist[$i] == 4){ if(!strstr($strselvaluelist,17)){ $strselvaluelist.='|17'; } } $i++; } } var_dump($strselvaluelist);

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34.01 ms | 402 KiB | 5 Q