Adds a zval container to the object. This is useful if you have to add properties which aren't simple types like integers or strings but arrays or other objects.

蛁 You may find that your pages aren't cached even if you don't output all of the headers above. There are a number of options that users may be able to set for their browser that change its default caching behavior. By sending the headers above, you should override any settings that may otherwise cause the output of your script to be cached.