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@ 2013-10-10T10:25:09Z

<?php
$strselvaluelist = '2';
$i=0;
if(!empty($strselvaluelist)){
   		
    while($i < strlen($strselvaluelist)){
	  	if($strselvaluelist[$i] == 4){
	  		if(!strstr(17, $strselvaluelist)){
       	    	$strselvaluelist.='|17';
       		}
        }
        $i++;
    }

    }
var_dump($strselvaluelist);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

39.55 ms | 402 KiB | 5 Q