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PHP Quiz PHP CertificatePHP sqrt() Function
Complete PHP Math Reference
Definition and Usage
The sqrt() function returns the square root of a number.
Syntax
sqrt(x)
| Parameter | Description |
|---|---|
| x | Required. A number |
Tips and Notes
Note: The sqrt() function will return -1.#IND if the parameter x is a negative number.
Example
In this example we will get 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))
?>
echo(sqrt(0) . "<br />");
echo(sqrt(1) . "<br />");
echo(sqrt(9) . "<br />");
echo(sqrt(0.64) . "<br />");
echo(sqrt(-9))
?>
The output of the code above will be:
0
1
3
0.8
-1.#IND
1
3
0.8
-1.#IND
Complete PHP Math Reference
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