Image by Eric M Martin via Flickr

Using WordPress 2.7.1, there is a problem with the Atom feed export.

In the apache error log are many occurrences of these two lines:

Bad arguments. in /var/www/.../wp-includes/rss.php on line 175,
The first argument, 'map_attrs', should be either NULL or a valid callback

The problem appears to be a simple coding error: the callback function should be called as array reference, array(object, user_func).

This has been reported as issue #9225, read on if you want to fix it for yourself right away…

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