sqrt
(PHP 4, PHP 5)
sqrt — Square root
Description
float sqrt
( float
$arg
)
Returns the square root of arg.
Parameters
-
arg -
The argument to process
Return Values
The square root of arg
or the special value NAN for negative numbers.
Examples
Example #1 sqrt() example
<?php
// Precision depends on your precision directive
echo sqrt(9); // 3
echo sqrt(10); // 3.16227766 ...
?>
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Коментарии
To get any root of a number your can use the pow() function:
pow(8, 1/3)
which gives you the third root of eight.
Jouhni