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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 |
---|---|
182 | /** |
183 | * Filters the category that gets used in the %category% permalink token. |
184 | * |
185 | * @since 3.5.0 |
186 | * |
187 | * @param WP_Term $cat The category to use in the permalink. |
188 | * @param array $cats Array of all categories (WP_Term objects) associated with the post. |
189 | * @param WP_Post $post The post in question. |
190 | */ |
191 | $category_object = apply_filters( 'post_link_category', $cats[0], $cats, $post ); |
192 |
|
193 | $category_object = get_term( $category_object, 'category' ); |
194 | $category = $category_object->slug; |
195 | if ( $category_object->parent ) { |
196 | $category = get_category_parents( $category_object->parent, false, '/', true ) . $category; |
197 | } |
198 | } |
199 | // show default category in permalinks, without |
200 | // having to assign it explicitly |