Best Answer Simon_P , 11 June 2013 - 04:22 PM
PHP 5.4 introduced STRICT error logging.
If you have WP_DEBUG disabled in wp-config then it looks like your server is set to output all PHP errors and warnings, just turn it off in the settings.
As you are on a VPS, guessing here as you didnt supply a URL, you will have to make the changes yourself.
This link may help you.Go to the full post