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Depending on the PHP version, if parse_ini_file() fails, the set_error_handler(array($obj, $method)) may not work where $method is a protected function.
The workaround is to create a public method for the error handler.
(In ) fixes #1242 - looks like a context bug in PHP because the method is a member of $this class (subclass of Zend_Config), and so should have access to its protected methods