Check if a string contains a certain number

Question

I have a string

8,7,13,14,16

Whats the easiest way to determine if a given number is present in that string?

$numberA = \"1         


        

Answer 1

Make sure you match the full number in the string, not just part of it.

function numberInList($num, $list) {
    return preg_match("/\b$num\b/", $list);
}
$string = "8,7,13,14,16";    
numberInList(13, $string); # returns 1
numberInList(8, $string); # returns 1
numberInList(1, $string); # returns 0
numberInList(3, $string); # returns 0