PHP Day Light Calculator: Calculate the day hours for a given location

This class can calculate the day hours for a given location.

It can take the latitude and longitude of a location and the time zone and it can calculate several types of time values. Currently it can return:

- The current time of the day
- The Sunrise and Sunset time
- The duration of the period with Sun light
- The remaining number of Sun light left for the day
- The duration of the period without Sun light
- The remaining number without Sun light left for the day
- Data for an image that can be the Sun or Moon images depending whether it is day or night

In Spanish:

Esta clase calcula las horas de luz y de obscuridad del dia asi como las horas de puesta y salida del sol pasando como parámetro las coordenadas geograficas y el uso horario(timezone). Tambien muestra una imagen con el sol o la luna si es de dia o de noche.