php echo strpos we are round 15 idb bisew 15..., Reported Questions, PHP

Question:<?php
echo strpos("We are round 15 @ IDB-BISEW","15");
?>
This code produces the following:

A 13 
B 14 
C 12 
D "15"

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Question:<?php echo strpos("We are round 15 @ IDB-BISEW","15"); ?> This code produces the following: