phpdbg_exec Attempts to set the execution context &reftitle.description; stringboolphpdbg_exec stringcontext &warn.undocumented.func; &reftitle.parameters; context &reftitle.returnvalues; If the execution context was set previously it is returned. If the execution context was not set previously &true; is returned. If the request to set the context fails, &false; is returned, and an E_WARNING raised.