Ability to add custom icons

Thanks to @Ahmedlag and his pull request, the ability to add custom marker icons has been added. See example4.php for a demonstration.

Project Rewrite

The newly rewritten version making use of PSR-4 autoloading and the current latest version of PHP (7.1). Functionally it should be identical to the previous version with some minor bug fixes.. enjoy!

Original version, PHP 5.2

This is the original working version of this code not updated in some ~5 years.