PHP sqrt () function
Examples
Returns the square root of the number of different:
<?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));
?>
Running instance »
Definition and Usage
sqrt () function returns the square root of a number.
grammar
sqrt( number );
参数 | 描述 |
---|---|
number | 必需。规定一个数。 |
technical details
return value: | Returns the number of square root, if the number is negative returns NAN. |
---|---|
Return type: | Float |
PHP version: | 4+ |
PHP Math Reference