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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
235 | /** |
236 | * Filters the category that gets used in the %category% permalink token. |
237 | * |
238 | * @since 3.5.0 |
239 | * |
240 | * @param WP_Term $cat The category to use in the permalink. |
241 | * @param array $cats Array of all categories (WP_Term objects) associated with the post. |
242 | * @param WP_Post $post The post in question. |
243 | */ |
244 | $category_object = apply_filters( 'post_link_category', $cats[0], $cats, $post ); |
245 |
|
246 | $category_object = get_term( $category_object, 'category' ); |
247 | $category = $category_object->slug; |
248 | if ( $category_object->parent ) { |
249 | $category = get_category_parents( $category_object->parent, false, '/', true ) . $category; |
250 | } |
251 | } |
252 | // Show default category in permalinks, |
253 | // without having to assign it explicitly. |