sqrt - PHP code example

How to Use the PHP Function sqrt in Your PHP Code

PHP is an open source programming language that allows you to manipulate numbers in a variety of ways. The language provides many mathematical functions, including the sqrt function that returns the square root of a given value. This article will describe the sqrt function and how to use it in your PHP code.

The sqrt() function is a float-typed function that takes a single argument and returns the square root of that number. The sqrt function is a useful mathematical function that can be used in many different applications. For example, if you are creating an e-commerce website and taking user input for quantities of products, you can use the sqrt() function to convert any quantity below zero into a positive value that can be added to a shopping cart. This will prevent the user from entering negative values and help to ensure that accurate calculations are made.

To utilize the sqrt() function, you must have a PHP version that supports floating point numbers. The sqrt() function always returns a float-typed value. If the number passed to the sqrt() function is negative, it will return NAN (Non-Number).

To demonstrate how to use the sqrt() function, we will write a simple program that prompts the user for a float-typed number. Then, the program will calculate and display the sqrt of that number. The code for this example is shown below.

sqrt example

$solAscension = atan2(0.91746 * $solAscension, 1);

        // adjust quadrant         if ($solLongitude > $threeQuarterCircle) {
            $solAscension += $fullCircle;
        } else if ($solLongitude > $quarterCircle) {
            $solAscension += $halfCircle;
        }

        // solar declination         $solDeclination  = 0.39782 * sin($solLongitude);
        $solDeclination /=  sqrt(-$solDeclination * $solDeclination + 1);
        $solDeclination  = atan2($solDeclination, 1);

        $solHorizon = $horizon - sin($solDeclination) * sin($radLatitude);
        $solHorizon /= cos($solDeclination) * cos($radLatitude);

        // midnight sun, always night         if (abs($solHorizon) > 1) {
            return false;
        }

        $solHorizon /= sqrt(-$solHorizon * $solHorizon + 1);

public static function Sqrt($op1, $scale = null)
    {
        if ($scale === null) {
            $scale = Zend_Locale_Math_PhpMath::$defaultScale;
        }

        if (empty($op1)) {
            $op1 = 0;
        }
        $op1 = self::normalize($op1);
        $result = sqrt($op1);
        if (is_nan($result)) {
            return NULL;
        }

        return self::round(self::normalize($result), $scale);
    }

    public static function Mod($op1, $op2)
    {
        if (empty($op1)) {
            $op1 = 0;
        }