pow
(PHP 4, PHP 5, PHP 7)
pow — Exponential expression
Description
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
Return Values
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.
Examples
Example #1 Some examples of pow()
<?php
var_dump(pow(2,?8));?//?int(256)
echo?pow(-1,?20);?//?1
echo?pow(0,?0);?//?1
echo?pow(10,?-1);?//?0.1
echo?pow(-1,?5.5);?//?PHP?>=5.2.2:?NAN
echo?pow(-1,?5.5);?//?PHP?<5.2.2:?-NAN
?>Notes
Note: This function will convert all input to a number, even non-scalar values, which could lead to weird results.
See Also
- exp() - Calculates the exponent of e
- sqrt() - Square root
- bcpow() - Raise an arbitrary precision number to another
- gmp_pow() - Raise number into power
← pi
rad2deg →
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