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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 |
---|---|
169 | /** |
170 | * Filter the category that gets used in the %category% permalink token. |
171 | * |
172 | * @since 3.5.0 |
173 | * |
174 | * @param stdClass $cat The category to use in the permalink. |
175 | * @param array $cats Array of all categories associated with the post. |
176 | * @param WP_Post $post The post in question. |
177 | */ |
178 | $category_object = apply_filters( 'post_link_category', $cats[0], $cats, $post ); |
179 |
|
180 | $category_object = get_term( $category_object, 'category' ); |
181 | $category = $category_object->slug; |
182 | if ( $parent = $category_object->parent ) |
183 | $category = get_category_parents($parent, false, '/', true) . $category; |
184 | } |
185 | // show default category in permalinks, without |
186 | // having to assign it explicitly |
187 | if ( empty($category) ) { |