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Fold Category List would typically be used to replace the functionality provided by the wp_list_cats tag that is usually found in the sidebar.php file in your active theme, itself located in wp-content/themes folder of your installation. To use, simply replace the code fragment that looks like this
<?php wp_list_cats ($args); ?>
with this:
<?php wswwpx_fold_category_list ($args); ?>
You can even use the same arguments as in the original call.
$args is optional and conforms exactly to those supported by the wp_list_cats tag that comes with WordPress 1.5, and which is explained in the Wordpress Codex
It is recommended however that at least the “hide_empty=0” option be set since without this any categories that lie below an empty category will not be shown
Since Fold Category List is built on top of wp_list_cats, it should retain all functionality of that tag, but enhance it with these further capabilities.

• Expand only the sub-hierarchy of the currently requested category to one layer down
• Keep all other sub-hierarchies collapsed to their parent

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Also diesen Teil suchen: wp_list_cats ... und durch diesen ersetzen: wswwpx_fold_category_list