Backgrounder: Call background processes

This class can be used to set up a callback function that will execute even if the user closes the browser window. It is meant to be used in long running processes, like pdf generation.

The callback function at the moment is an e-mail message sent to the user. This can be changed by the developer.

This class forks a process in the Web server and runs the process in a seperate child process until done. This means that the user can carry on using the system in the main process, while the task is completing. Once the child process is done, it will close and do some garbage collection and destroy the child process, finally calling the callback function and sending a mail to let you know its done.