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@ 2013-10-10T10:38:42Z

<?php
$strselvaluelist = '4|2';
if(!empty($strselvaluelist)){
        echo 0;
       if(strstr($strselvaluelist,'4')){
        echo 1;
           if(!strstr($strselvaluelist,'17')){
               $strselvaluelist.='|17';
               echo 2;
            }
        }
}
var_dump($strselvaluelist);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
strstr: documentation ( source)

preferences:dark modelive preview

31.98 ms | 402 KiB | 5 Q