cos - PHP code example

PHP Function Cos - Simple and Efficient Way to Calculate Cosine Ratios in PHP

php function cos is one of the predefined functions that can be used in PHP to perform trigonometric calculations. The function takes a single argument that represents an angle in radians and returns the cosine ratio of the number passed to it. It is very useful for developers who are dealing with a lot of maths related tasks.

PHP is a very powerful language that has many built in functions that can be used for various purposes. A function is a discrete block of code that performs a specific task and can be called by another piece of code within the same file. Functions are very helpful and make code more manageable because of their modular nature.

In PHP a function must be declared with the word function followed by parentheses and then the name of the function inside it. The function can be defined in any order within the file and it is important to remember that variables that are created inside functions have local scope and cannot conflict with variables that are made outside of the function.

The function cos(int(p)) in PHP is a simple and efficient way to calculate the cosine of an angle. It returns the cosine ratio of a number given to it as a parameter and can be found in all versions of PHP. It is a very useful function for anyone who works with maths and trigonometry in their programming jobs. You can use the function along with other mathematical and geometric functions to create a graph.

cos example

$solLongitude  = $solAnomoly + 0.0334405 * sin($solAnomoly);
        $solLongitude += 4.93289 + 3.49066E-4 * sin(2 * $solAnomoly);

        // get quadrant         $solLongitude = $this->_range($solLongitude, $fullCircle);

        if (($solLongitude / $quarterCircle) - intval($solLongitude / $quarterCircle) == 0) {
            $solLongitude += 4.84814E-6;
        }

        // solar ascension         $solAscension = sin($solLongitude) / cos($solLongitude);
        $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);

    if ((int) $angle == $angle && $angle % 90 == 0) {
      $imprecision = 0;
      $correction = 0;
    }
    else {
      $imprecision = -0.00001;
      $correction = 0.5;
    }

    // Do the trigonometry, applying imprecision fixes where needed.     $rad = deg2rad($angle);
    $cos = cos($rad);
    $sin = sin($rad);
    $a = $this->width * $cos;
    $b = $this->height * $sin + $correction;
    $c = $this->width * $sin;
    $d = $this->height * $cos + $correction;
    if ((int) $angle == $angle && in_array($angle, [60, 150, 300])) {
      $a = $this->fixImprecision($a, $imprecision);
      $b = $this->fixImprecision($b, $imprecision);
      $c = $this->fixImprecision($c, $imprecision);
      $d = $this->fixImprecision($d, $imprecision);
    }