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sqrt

Description

The sqrt of Math for PHP square root.

Syntax

sqrt(
    float $num
): float

Parameters

num

The argument to process.

Return

Returns the square root of num or the special value NAN for negative numbers.

Examples

1 · negative

<?

$num = -9;

$return = sqrt($num);

echo $return;

NAN

2 · positive

<?

$num = 9;

$return = sqrt($num);

echo $return;

3