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Okay, I think I'm pretty close. I have the following going on:

$cat_id = get_cat_id('library');

wp_dropdown_categories('hierarchical=1&parent=$cat_id');

However, it doesn't work with $cat_id in there. It does work when I put the category's ID number in there (which I got when I echoed $cat_id), but obviously that presents a problem when I install the site on the real server. What should I try? Thanks!

1 Answer 1

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If you change your single quote marks in to double quote marks it should work :

$cat_id = get_cat_id('library');
wp_dropdown_categories("hierarchical=1&parent=$cat_id");

but if you really want to make it more flexible you can phrase your arguments as an array:

$args = array(
 'hierarchical' => 1,
 'parent' => get_cat_id('library'));
wp_dropdown_categories($args);

and if you want to make it even more flexible to get the current category's children you can use get_query_var('cat'); assuming that you are in your category.php file, so:

$args = array(
 'hierarchical' => 1,
 'parent' => get_query_var('cat'));
wp_dropdown_categories($args);
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  • The PHP manual has more info about the difference between single and double quoted strings. Basically it boils down to the fact that a $ in a single quoted string will not indicate a variable, so your $cat_id stays $cat_id, not 11 or whatever the category ID might be.
    – Jan Fabry
    Commented Apr 8, 2011 at 9:02
  • Doh! I can't believe I forgot to concatenate that variable. No wonder I felt like it's worked before. Thank you very much for answering my dumb question. Also, I didn't know about the double-quote trick before.
    – Webkohder
    Commented Apr 8, 2011 at 16:46

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