For those who are interested, I misspoke at the meeting.  The function that I was refering to find a '?' within another string is 'strpos' and not 'substr'

From the PHP manual:

FALSE

FALSE

FALSE

0

Here's a piece of code that should work for the problem that Rusty was talking about.  (Basically, only allow 1 "?" in a string.)

** Tom **

---------------------------------

$string_to_test = "This is a test string? I don't know, is it?";
$once_only = "?";
$oo_pos = strpos($string_to_test, $once_only, 0);
if ($oo_pos === false)
   {
    // not found case
 echo "No question found
";
   }
else
   {
    $oo_sec = strpos($string_to_test, $once_only, $oo_pos+1);
 if ($oo_sec === false)
    {
     // Just one found
  echo "Success, found a question
";
    }
 else
    {
     // found more than one
  echo "Opps! Found more than one question
";
    }
   }
?>