PHP: power bug - 10^(1/4) == 10?

Why 10^(1/4) is 10? which function should I use to obtain correct result?

My test line is:

 echo (10^(100/400)). " vs " . 10;

开发者_JS百科and my output is

10 vs 10

EDIT:

thanks for answers, I will use pow()

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^ is the XOR bitwise operator. Use pow(10, 1/4) (docs) instead.

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Pretend you're a cartoon superhero with POW!

echo pow(10, 1/4);

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After a quick google search: http://php.net/manual/en/function.pow.php

Use pow(10, 1/4)

I think the ^ is some kind of binary operation, which is not what you want.

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What you are actually calculating there is 10, xor (100 integer divided by 400), which is 10 xor 0, which is 10.