This snippet shows an example of the usage of the sandbox in an AJAX event context.

The value $iCounter increments and is persisted on each click on the button.

Also note how the sandbox implements an init() method, automatically called by the Framework if defined, giving the developper a chance to initalize some internal members, in our case, the typoscript conf taken from the parent plugin.

For more informations, read this:

• The reference: http://formidable.typo3.ug/reference/control/sandbox.html
  
• Working example: http://formidable.typo3.ug/tutorials/ajax-with-the-sandbox.html