Errors after upgrade from PHP4 to PHP5

Hey,

ok, I figured out that if I uncomment in wp-includes/widgets.php these lines starting from line 686 that everything turns back to normal:

foreach ( array_keys($options) as $o ) {
		// Old widgets can have null values for some reason
		if ( !isset($options[$o]['title']) || !isset($options[$o]['text']) )
			continue;
		$id = "text-$o"; // Never never never translate an id
		wp_register_sidebar_widget($id, $name, 'wp_widget_text', $widget_ops, array( 'number' => $o ));
		wp_register_widget_control($id, $name, 'wp_widget_text_control', $control_ops, array( 'number' => $o ));
	}

Surely there has to be another way, though. I am not using any widgets on my blog, I don’t even have a sidebar, so that’s probably why this works for me.

Cheers,
Boris

Maybe I should have searched for this first. Sorry for that. For everybody with a similar problem, here’s the solution for all my problems.

Adding this to my theme’s functions.php, deleting my browser cache and then loading the site again fixed all the warnings and errors:
delete_option('widget_rss');

You have to remember to delete that line again once the warnings have disappeared.

All my special characters, plus a couple plugins (Buy Me Beer & Contact Form 7), were mangled. Commenting this line out of my wp-config.php file solved all that:
define('DB_CHARSET', 'utf8');

Thanks to Otto42 for that!