Nested categories for single.php

Thanks for getting back to me.

The categories are of the content itself (rather than all the categories in the website). For example, the categories of this content: http://doubleagents.webfactional.com/site/archives/171 is Camden Arts Centre, Event, etc. Essentially the same as the_category(), but I can’t get this to organise itself well.

Does that make sense?

Thanks,
Andrew

This is the code I’m using, to show a post’s set of nested sub-categories in a definition list. It seems to be working, but it could probably be done more efficiently.

Notes:
1. the parent categories aren’t links, but could easily be made to be
2. it wouldn’t work well for sub-sub-categories (not an issue for this website)

<dl id="categories">
		<?php
		foreach((get_the_category()) as $cat) {
			if ($cat->category_parent == 0) {
				// root/parent category (don't do anything - this should not have been a link - but it could be if that's the way you wanted it set-up)
			} else {
				// show category link
				// get category_parent details (nicename and cat_name required)
				// only show parent category if it is first one
				if ($cat->category_parent != $oldCatParentId) {
					$catParentName = get_cat_name( $cat->category_parent );
					echo '<dt>'.$catParentName.':</dt>';
				}
				$oldCatParentId = $cat->category_parent;
				echo '<dd><a href="'.get_category_link($cat->cat_ID).'">'. $cat->cat_name . '</a>' . '</dd>';
			}
		} ?>
</dl> <!-- /#categories -->

Okay – this is a way of doing it (if anyone else is interested)…

<dl id="categories">
<?php
$organisedCats = get_the_category();
$catOutput = "";
$catArray = array();

foreach((get_the_category()) as $cat) {
	if ($cat->category_parent == 0) {
		// root/parent category (don't do anything - this should not have been chosen)
	} else {
		if ($catArray[$cat->category_parent]) {
			// if the array bit already exists, then dobn't do anything
		} else {
			// write the title of the category
			$catParentName = get_cat_name( $cat->category_parent );
			$catArray[$cat->category_parent] = '<dt>'.$catParentName.':</dt>';
		}
		// write in the specific category
		$catArray[$cat->category_parent] .= '<dd><a href="'.get_category_link($cat->cat_ID).'">'. $cat->cat_name . '</a>' . '</dd>';
	}
}
foreach($catArray as $cat) {
	echo $cat;
}
?>

</dl> <!-- /#categories -->