Why are you doing a === to true?  strpos is clearly documented to return a integer specifying the position in the string on a match or false on a failure.  It will never return true.

A note from the PHP manual on strstr:

If you only want to determine if a particular needle occurs within haystack, use the faster and less memory intensive function strpos() instead. 

A warning from the PHP manual on strpos:

This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE, such as 0 or "". Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

As for why I'm doing a check for true, it's because '0' evaluates to false.

If my original string was 'time is money' then $position would be 0:

Reproduce code:
---------------
$string = 'time is money';
$srchstring = 'time';
$position = strpos($string, $srchstring);
echo 'String: '.$string.'<br />';
echo 'Search string: '.$srchstring.'<br />';
echo 'Position of search string: '.$position.'<br />';

if ((strpos($string, $srchstring) === true)) echo 'Search string is included in the original string!'; else echo 'Search string is not included in the original string!';


Expected result:
----------------
Search string is included in the original string!


Actual result:
--------------
String: time is money
Search string: time
Position of search string: 0
Search string is not included in the original string!

Apparently the PHP manual isn't so clear on how to use the === operator.

So, what it really means is that you should check for something like this:

$string = 'time is money';
$srchstring = 'time';
$position = strpos($string, $srchstring);

if (($position > 0) || ($position === 0)) echo 'Search string is included in the original string!'; else echo 'Search string is not included in the original string!';

No, it means you should do a !== false check.  Anything except false means it found it.