PHP pow() Function

PHPServer Side ProgrammingProgramming

Definition and Usage

The pow () function is used to compute power of a certain number. It returns xy calculation, also termed as x raised to y. PHP also provides "**" asexponentiation operator.

So, pow(x,y) returns xy which is same as x**y

Syntax

pow ( number $base , number $exp ) : number

Parameters

Sr.NoParameter & Description
1base
The base to be raised
2exp
power to which base needs to be raised

Return Values

PHP pow() function returns base raised to power of exp. If both arguments are non-negative integers,the result is returned as integer, otherwise it is returned as a float.

PHP Version

This function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.

Example

 Live Demo

Following example calculates 102 using pow() function

<?php
   echo "pow(10,2) = " . pow(10,2);
   echo " using ** operator " . 10**2;
?>

Output

This will produce following result −

pow(10,2) = 100 using ** operator 100

Example

 Live Demo

Any number raised to 0 results in 1. This is verified by following example −

<?php
   $x=10;
   $y=0;
   echo "pow(" . $x, "," . $y . ")=". pow($x,$y);
?>

Output

This will produce following result −

pow(10,0)=1

Example

 Live Demo

Following example computes square root of 100 using pow() function;

<?php
   $x=100;
   $y=0.5;
   echo "pow(" . $x, "," . $y . ")=". pow($x,$y) . "\n";
   echo "using sqrt() function : ". sqrt(100);
?>

Output

This will produce following result −

pow(100,0.5)=10
using sqrt() function : 10

Example

 Live Demo

This example shows uses pow() function in calculation of area of circle.−

<?php
   $radius=5;
   echo "radius = " . $radius . " area = " . M_PI*pow(5,2);
?>

Output

This will produce following result −

radius = 5 area = 78.539816339745
raja
Published on 30-Jun-2020 10:45:50
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