note 105614 added to function.strstr

I explained this to my newbies the difference though it would be good to demonstrate this here. If you are evaluating a list you cannot use strstr as it looks for any occurance. The correct way is the function which evaluates a true or false on the exact value to check. In the following example I have a list of promotion ids I want to evaluate whether or not a promotion exists: //Wrong $promotion = strstr("25,56","2"); if($promotion){ echo "found"; }else{ echo "not found"; } //right function detectPromotion($string,$promotion){ foreach(explode(",",$string) as $promotionToCheck){ echo "checkin ".$promotionToCheck."==".$promotion."<br/>"; if($promotionToCheck==$promotion){ $promotionFound=true; } } return $promotionFound; } echo detectPromotion("2,56","2"); ---- Server IP: 69.147.83.197 Probable Submitter: 173.14.9.174 ---- Manual Page -- http://www.php.net/manual/en/function.strstr.php Edit -- https://master.php.net/note/edit/105614 Del: integrated -- https://master.php.net/note/delete/105614/integrated Del: useless -- https://master.php.net/note/delete/105614/useless Del: bad code -- https://master.php.net/note/delete/105614/bad+code Del: spam -- https://master.php.net/note/delete/105614/spam Del: non-english -- https://master.php.net/note/delete/105614/non-english Del: in docs -- https://master.php.net/note/delete/105614/in+docs Del: other reasons-- https://master.php.net/note/delete/105614 Reject -- https://master.php.net/note/reject/105614 Search -- https://master.php.net/manage/user-notes.php