pow
(PHP 4, PHP 5)
pow — Exponential expression
Parameters
- base
-
The base to use
- exp
-
The exponent
Return Values
base raised to the power of exp. If the result can be represented as integer it will be returned as type integer, else it will be returned as type float.
Changelog
| Version | Description |
|---|---|
| 4.2.0 | No warning is emitted on errors, even if the value can't be computed. |
| 4.0.6 | The function will now return integer results if possible, before this it always returned a float result. For older versions, you may receive a bogus result for complex numbers. |
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(-1, 5.5); // PHP >4.0.6 NAN
echo pow(-1, 5.5); // PHP <=4.0.6 1.#IND
?>
Notes
Note:
This function will convert all input to a number, even non-scalar values, which could lead to weird results.