note 90993 deleted from function.defined by danbrown

Note Submitter: steven at acko dot net ---- You'd expect to be able to pass anything into defined(), and that it would just return TRUE or FALSE depending on whether the input is a valid constant. You'd be wrong. Invoking defined('::') will throw a fatal, unrecoverable error. This will happen for any string which contains '::' prefixed by an invalid class name. GO PHP! You've created a function designed to make a validating statement about its input, but which cannot be invoked safely without validating its input beforehand.