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add_filter('walker_nav_menu_start_el', 'description_in_nav_el', 10, 4);
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function description_in_nav_el($item_output, $item, $depth, $args)
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{
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	return preg_replace('/(<a.*?>[^<]*?)</', '$1' . "<span>{$item->post_content}</span><", $item_output);
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}