contao/core — pull request #6106 by tristanlins (2013-08-24 11:37:49+00:00)
Title: Use constant E_USER_DEPRECATED instead of int code.

The constant `E_USER_DEPRECATED` is part of PHP since 5.3.0, which is the required min version for Contao 3+.
See http://php.net/manual/de/errorfunc.constants.php