PHP sqrt() Function
Example
Return the square root of different numbers:
<?php
echo(sqrt(0) . "<br>");
echo(sqrt(1) . "<br>");
echo(sqrt(9) . "<br>");
echo(sqrt(0.64) . "<br>");
echo(sqrt(-9));
?>
Run example »
Definition and Usage
The sqrt() function returns the square root of a number.
Syntax
sqrt(number);
| Parameter | Description |
|---|---|
| number | Required. Specifies a number |
Technical Details
| Return Value: | The square root of number, or NAN for negative numbers |
|---|---|
| Return Type: | Float |
| PHP Version: | 4+ |
PHP Math Reference
