Hi!

The result is "Fatal error: Class 'C' not found". Is this result expected?

Yes. Define your classes before using them, or use autoloading.

Why?

(Highly technical details) Because C can't be early-bound on compile time due to the dependency on the interface and thus at the time of the call it's not defined, because the definition happens at run-time when control arrives to the point of class definition. Since early binding is quite complex, it is best to assume classes always are defined at run-time and define them before use.
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Stanislav Malyshev, Software Architect
SugarCRM: http://www.sugarcrm.com/
(408)454-6900 ext. 227

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