PHP sqrt() Function Example

If you want to find out the square root of a number then use sqrt() function.

PHP sqrt() Function Example:

If you want to find out the square root of a number then use sqrt() function. This function return square root of a number. The sqrt() function will return NAN if the number is a negative.

Syntax:

sqrt(number)

Example:

<?php
echo(sqrt(0) . "<br />");
echo(sqrt(9) . "<br />");
echo(sqrt(0.64) . "<br />");
echo(sqrt(-9))
?> 

Output:

The output of this example is:

0
3
0.8
NAN

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