(Yaf >=1.0.0) Retrieve an Application instance
(Yaf >=1.0.0) Retrive the config instance
(Yaf >=2.1.2) Clear the last error info public
(Yaf >=2.1.4) Change the application directory
(Yaf >=2.1.2) Get message of the last occurred error
(Yaf >=1.0.0) Execute a callback public void
(Yaf >=1.0.0) Retrive environ public void
(Yaf >=1.0.0) The __destruct purpose public
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