Finding number in a string

Question

I am trying to find a number in a string from my database to replace it.  Here is my funciton:
function findUserID($friendsString, $userToFind){
          echo $friendsString . " " . $userToFind;
          $pos = strpos($friendsString,$userToFind);
          if($pos){
                    return true;
          return false;
it returns "25,29 25".  How can it not find 25 in that string?

Answer 1

I understand that it starts at 0.  it should still work.  i had it working before.  i must've changed something. 
here is my code for passing to the function:
$query = mysql_query("SELECT friends, pendingFriendRequest
FROM members
WHERE username = '$userID'");
if (mysql_affected_rows() > 0) {
          $row = mysql_fetch_array($query) or die(mysql_error());
          $friends = $row['friends'];
          $pendingFriends = $row['pendingFriendRequest'];
// If the user exists in the waiting list, then
//continue (we must confirm that they are first by checking the DB
$test = findUserID($pendingFriends, "25");
if($test){
          // If they are, then continue to add them
          $test = confirmFriend($pendingFriends, "25");
          if($test) {
                    echo "<br />You have confirmed " . findUserName(24) . "as a friend.";
          } else {
                    echo "<br />Error: Please try again, or contact us.";
} else {
          echo "<br />Error: You either have this person as a friend already, or there was an internal error.";