strpos() !== true always evaluates true, why?

$cartArray structure:

Array ( [0] => 1. X => 2. Y [2] => 3. Z [3] => 4. XX [4] => 5. YY [5] => ) 

$list:

$list = array(
    "1.",
    "2.",
    "3.",
    "4.",
    "5."
);

Function

function alignNum($cartArray, $list)
{
   foreach($cartArray as $cA)
   {
      echo "<br />" . $cA . "<br /><br />";
      foreach($list as $l)
      {
            echo $l . "<br />";
            echo "Type of \$l is " . gettype($l) . " and type of \$cA is " . gettype($cA) . "<br />";

            $pos = strpos($cA, $l);

            echo "Comparing " . $l . " to " . $cA . "<br />";

            if ($pos !== true)
            {
                echo "<br />" . $l . " was not found in " . $cA . "<br /><br />";
                continue;
            }
            else
            {
                $post_cA = str_replace("EUR", "EUR</span>", $cA);

                $new_cA[] = (str_replace($l, substr($l, 0, -4) . "<span style='float: right>'", $cA)) . $post_cA;

                return $new_cA;
            }


          }
      }
}

$new_cart = alignNum($cart, $list);

So, I keep getting my custom debug message: "X was not found in Y". I.e it's not founding it X in ANY of the provided strings.

It's not a question of types either. Both are strings.

Any ideas?

EDIT: Also, note that I've censored some stuff out, since this is business related code.

It is generally a bad idea (unless you are C programmer) to compare numeric and boolean even in
if ($pos != true)
but in
if ($pos !== true)
AFAIK it will NEVER match because the variables are different types