When Upgrading I get this message: ----- The following warnings were detected when verifying that your server can run XenForo: Your server has disabled core PHP functions via the disable_functions directive in php.ini. Depending on the functions that have been disabled, this may cause unexpected problems in XenForo. All PHP functions should be enabled. These may affect the proper execution of XenForo at times and should be resolved if possible. ----- I would like to know which functions does Xenforo need. Thanks.