Square Root Function in PHP

The sqrt() function Returns the square root of a number.

Syntax

sqrt(num)

Parameters

• num − The number for which you want to find the square root

Return

The sqrt() function Returns the square root of the specified number.

Example

 Live Demo

<?php
   echo(sqrt(16));
?>

Output

4

Example

Let us see another example −

 Live Demo

<?php
   echo(sqrt(0.25) . "<br>");
?>

Output

0.5<br>

Example

Let us see another example −

 Live Demo

<?php
   echo(sqrt(-144));
?>

Output

NAN