sqrt

Square root

Description

float sqrt(float $num)

Returns the square root of num.

Parameters

num: The argument to process

Return Values

The square root of num 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 ...
?>

See Also

pow
M_SQRTPI - sqrt(pi)
M_2_SQRTPI - 2/sqrt(pi)
M_SQRT2 - sqrt(2)
M_SQRT3 - sqrt(3)
M_SQRT1_2 - 1/sqrt(2)