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sqrt

(PHP 4, PHP 5, PHP 7)

Square root

float sqrt ( float $arg )

Returns the square root of arg.

Parameters:

arg

The argument to process

Returns:

The square root of arg or the special value NAN for negative numbers.

Examples:

sqrt() example

<?php
// Precision depends on your precision directive
echo sqrt(9); // 3
echo sqrt(10); // 3.16227766 ...
?>

See also:

Links:

http://php.net/manual/en/function.sqrt.php

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2016-02-24 16:02:32

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