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Asked: 2026-05-10T17:37:24+00:00

I’m trying to host a PHP web site that was given to me. I

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I’m trying to host a PHP web site that was given to me. I see this warning:

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

What does this mean? How might I track down the source of this problem within the code?

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1 Answer

  1. basically you have a variable with the same name as your session. ex:

    $_SESSION['var1'] = null; $var1 = 'something';

    which will reproduce this error. you can stop PHP from trying to find existing variables and warning you about them by adding these lines to your script:

    ini_set('session.bug_compat_warn', 0); ini_set('session.bug_compat_42', 0);

    these values can be set in php.ini or .htaccess as well

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