pow
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
© 1997–2017 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.pow.php
