$wgGroupPermissions['*']['edit'] = false;
$wgGroupPermissions['*']['createpage'] = false;
 
# Anonymous users can't create pages
# Only users with accounts 3 hours or older can create pages
# (like Wikipedia!).  Requires MW 1.6 or higher.
$wgGroupPermissions['*'            ]['createpage'] = false;
$wgGroupPermissions['user'         ]['createpage'] = false;
$wgGroupPermissions['autoconfirmed']['createpage'] = true;
$wgAutoConfirmAge = 10800 * 4; # 3 hours