pow() vs. float when doing match.

Hi! There is the calculation errors for the floating point, so I checked the PHP website. On that website, the function webpage, pow(). It said that "In PHP 4.0.6 and earlier pow() always returned a float, and did not issue warnings.". So, there was some changes to the pow() on PHP 4.0.7 and after. Let's do the demo script. echo pow(0, 0.0829); It should return a "0" as it did in version 4.0.6 and before. But version 4.0.7 and after, it returned a "-1.#IND". Why is that? What is the other way around to fix the problem? Let me know! Thanks, Scott