(PHP 4, PHP 5, PHP 7)
Exponential expression
number pow ( number $base, number $exp )
Returns base raised to the power of exp.
Note:
In PHP 5.6 onwards, you may prefer to use the ** operator.
Parameters:
base
The base to use
exp
The exponent
Returns:
base raised to the power of exp. If both arguments are non-negative integers and the result can be represented as an integer, the result will be returned with integer type, otherwise it will be returned as a float.
Notes:
This function will convert all input to a number, even non-scalar values, which could lead to weird results.
Examples:
Some examples of pow()
<?php var_dump(pow(2, 8)); // int(256) echo pow(-1, 20); // 1 echo pow(0, 0); // 1 echo pow(-1, 5.5); // PHP >4.0.6 NAN echo pow(-1, 5.5); // PHP <=4.0.6 1.#IND ?>
See also:
exp() -
sqrt() -
bcpow() -
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