//error_reporting=2
PHP Warning:  include_once(): Failed opening 'RegexpLineParser.php' for inclusion (include_path='.:/usr/share/pear') in PhpParser.php on line 25
//error_reporting=8
PHP Notice:  Undefined index:  SERVER_NAME in /path/to/file/Settings.php on line 25

PHP Fatal error:  Undefined class constant 'MESSAGE' in /MyPhpFile.php on line 35

PHP Parse error:  Undefined class constant 'MESSAGE' in /MyPhpFile.php on line 35

From Apache log
[Tue Mar 02 08:22:40 2010] [error] [client 192.168.1.172] PHP Warning:  Missing argument 1 for Title::getText(), called in Title.php on line 22 and defined in Category.php on line 34