strrpos in PHP finding last character position instead?

Question

$string = "01234567890*****12345678901234567890*";  
echo strrpos($string,'*****');

why does this return 36 and not 15? (click here to test)

from php.net
strrpos — Find the position of the last occurrence of a substring in a string

What am I missing out on???
Thank you!

SOLUTION: using the answers bellow, I provided a PHP4 alternative

$haystack = "01234567890*****12345678901234567890*";  
$needle              = '*****';

$position = strlen($haystack) - strlen($needle) - strpos(strrev($haystack),strrev($needle));
echo $position; // 11

Answer 1

Probably you're using PHP 4:

from php.net

needle: If needle is not a string, it is converted to an integer and applied as the ordinal value of a character. The needle can only be a single character in PHP 4.