pow

(PHP 4, PHP 5, PHP 7, PHP 8)

powExponential expression

Description

pow(mixed $num, mixed $exponent): int|float|object

Returns num raised to the power of exponent.

Note:

It is possible to use the ** operator instead.

Parameters

num

The base to use

exponent

The exponent

Return Values

num raised to the power of exponent. If both arguments are non-negative integers and the result can be represented as an integer, the result will be returned with int type, otherwise it will be returned as a float.

Examples

Example #1 Some examples of pow()

<?php

var_dump
(pow(28)); // int(256)
echo pow(-120); // 1
echo pow(00); // 1
echo pow(10, -1); // 0.1

echo pow(-15.5); // 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

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