How to define an empty object in PHP

by 
$x = new stdClass();

A comment in the manual sums it up best:

stdClass is the default PHP object.
stdClass has no properties, methods or
parent. It does not support magic
methods, and implements no interfaces.

When you cast a scalar or array as
Object, you get an instance of
stdClass. You can use stdClass
whenever you need a generic object
instance.

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