Trigonometric tools is the sine of an angle can be computed from the cosine or tangent, while the cosine from the sine and tangent. Requirements: PHP 5.0 or higher
PHP gauge can create an image with a gauge and a pointer rendered at a given angle. The span of rotation angle, the minimum and maximum values, and the maximum values for green and yellow areas are configurable parameters. The gauge image that is generated according to a predefined size is served as the active script output in GIF, PNG, ...