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An improved version of the original Jared/Gary version which checks for, in order, the presence of: 1) subcategory template ID 2) subcategory template slug 3) parent category ID 4) parent category slug 5) general category (category.php) You can use it in the function.php file of your theme.
/**
* Apply a template to all subcategories of a certain parent category.
*
* Initial work by Jared Atchison.
* http://www.jaredatchison.com/2011/10/02/taking-advantage-of-the-template_include-filter/
*
* Revisited by GaryJones https://gist.github.com/GaryJones/1258784
* https://gist.github.com/GaryJones/1258784
*
* An improved version of the original Jared/Gary version which checks for, in order, the presence of the templates:
* 1) category-{subcategory-id}.php
* 2) category-{subcategory-slug}.php
* 3) category-{parent-id}.php
* 4) category-{parent-slug}.php
* 5) category.php
*
* @author sardbaba
*
* @param string $template Existing path to template file
* @return string Potentially amended path to template file
*/
function sardbaba_template_include( $template ) {
if ( ! is_category() ) {
return $template;
}
$current_cat = get_query_var( 'cat' );
$category_info = get_category( $current_cat );
$base_url = get_stylesheet_directory() . '/category-';
// Check first if exists a subcategory template.
$current_cat_tpl_id = $base_url . $current_cat . '.php';
$current_cat_tpl_slug = $base_url . $category_info->slug . '.php';
if ( is_readable( $current_cat_tpl_id ) ) {
return $current_cat_tpl_id;
}
elseif ( is_readable( $current_cat_tpl_slug ) ) {
return $current_cat_tpl_slug;
}
// Check if exists a parent category template.
if ( $category_info->parent == 0 ) {
// This is a parent template, use the predefined one.
return $template;
}
// The parent category exists, so, check parent template.
$parent_cat = get_category( $category_info->parent );
$parent_cat_tpl_id = $base_url . $parent_cat->term_id . '.php';
$parent_cat_tpl_slug = $base_url . $parent_cat->slug . '.php';
if ( is_readable( $parent_cat_tpl_id ) ) {
return $parent_cat_tpl_id;
}
elseif ( is_readable( $parent_cat_tpl_slug ) ) {
return $parent_cat_tpl_slug;
}
// Nothing found, just use the default template.
return $template;
}
add_filter( 'template_include', 'sardbaba_template_include' );
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