What does sqrt function mean?

What does the sqrt function mean?

Function: Find the square root of the parameters.

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Syntax:

sqrt(X)

Parameters: X represents the number for finding the square root.

Description: Return the result of the square root of parameter X.

php sqrt() function usage example:

<?php
$i = 9;
$i = sqrt($i);
$j = 8;
$j = sqrt($j);
$k = -5;
$k = sqrt($k);
echo $i."*****".$j."*****".$k;
?>

Output:

3*****2.8284271247462*****NAN

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