Return the square root of different numbers in PHP

Description

The following code shows how to return the square root of different numbers.

Example

  //from   w  ww  . j a  va 2  s. co  m
<?php
    echo(sqrt(0) . "<br>");
    echo(sqrt(1) . "<br>");
    echo(sqrt(9) . "<br>");
    echo(sqrt(0.64) . "<br>");
    echo(sqrt(-9));
?>

The code above generates the following result.