PHP pow function

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pow

(PHP 3, PHP 4, PHP 5)

Returns base raised to the power of
exp. If possible, this function will
return an integer.

If the power cannot be computed, a warning will be issued,
and pow() will return FALSE. Since PHP 4.2.0
pow() doesn’t issue any warning.

Note:
PHP cannot handle negative bases.

Example 1. Some examples of pow()

 
var_dump(pow(2, 8)); // int(256)
echo pow(-1, 20); // 1
echo pow(0, 0); // 1
 
echo pow(-1, 5.5); // error

In PHP 4.0.6 and earlier pow() always returned
a float, and did not issue warnings.

See also:
exp(),
sqrt(),
bcpow(), and
gmp_pow(),