Thread:Extension talk:Access Log/PHP Parse / Fatal Errors MWDebug.php & GlobalFunctions.php

Please help, I noticed today that my wiki is suddenly completely white. I viewed the error logs and saw two errors that were breaking it (previously it was fine before this and I hadn't touched it) It was working for awhile then all of a sudden it goes white with these errors:

[19-Apr-2015 22:58:58 America/Chicago] PHP Parse error: syntax error, unexpected '|' in /wiki/includes/debug/MWDebug.php on line 341 [19-Apr-2015 22:58:58 America/Chicago] PHP Fatal error: Class 'MWDebug' not found in /wiki/includes/GlobalFunctions.php on line 981

I'm very novice when it comes to PHP, if anyone has any insight I would be greatly appreciative!