PHP Program to Find Square Root of a Number

Given a Number, the task is to find the Square Root of Number in PHP.

Examples:

Input: 15
Output: 5

Input: 30
Output: 5.477

There are three methods to find the square root of the given number, these are:

Using sqrt() Function

The sqrt() function is used to calculate the square root of a number.

Syntax:

float sqrt( $value )

Example:

PHP

<?php

function squareRoot($number) {
    return sqrt($number);
}

$num = 36;
echo "Square Root: " . squareRoot($num);

?>

Output

Square Root: 6

Using pow() Function

The pow() function is used to calculate the power of a number. Here, we calculate the power 1/2 or 0.5 of given number.

Syntax:

pow($number, 0.5);

Example:

PHP

<?php

function squareRoot($number) {
    return pow($number, 0.5);
}

$num = 30;
echo "Square Root: " . squareRoot($num);

?>

Output

Square Root: 5.4772255750517

Using Exponentiation Operator (**)

The exponential operator (**) is used to calculate the exponent power of number. Here, we use exponent power to 0.5.

Syntax:

$number ** 0.5;

Example:

PHP

<?php

function squareRoot($number) {
    return $number ** 0.5;
}

$num = 36;
echo "Square Root: " . squareRoot($num);

?>

Output

Square Root: 6