Warning: Unknown: Your script possibly relies on a session
side-effect which existed until PHP 4.2.3. Please be advised that
the session extension does not consider global variables as a
source of data, unless register_globals is enabled. You can disable
this functionality and this warning by setting
session.bug_compat_42 or session.bug_compat_warn to off,
respectively. in Unknown on line 0
This error likely appears when setting some thing like this $_SESSION['something'] = NULL; or you are assigning a variables value to a session which is null. hopefully.
what people say is better turn off this warning by 1. "session.bug_compat_42 = 0" in your php.ini 2. setting the following in your .htaccess file php_flag session.bug_compat_42 0 php_flag session.bug_compat_warn 0 3. Directly write the following code in your php script where you want to stop the warning. It is better if you set it in a common include file. ini_set('session.bug_compat_42',0); ini_set('session.bug_compat_warn',0); ...