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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.
This hook occurs 3 times in this file.
Line | Code |
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156 | * @param string $separator Optional, default is empty string. Separator for between the categories. |
157 | * @param string $parents Optional. How to display the parents. |
158 | * @param int $post_id Optional. Post ID to retrieve categories. |
159 | * @return string |
160 | */ |
161 | function get_the_category_list( $separator = '', $parents='', $post_id = false ) { |
162 | global $wp_rewrite; |
163 | if ( ! is_object_in_taxonomy( get_post_type( $post_id ), 'category' ) ) { |
164 | /** This filter is documented in wp-includes/category-template.php */ |
165 | return apply_filters( 'the_category', '', $separator, $parents ); |
166 | } |
167 |
|
168 | $categories = get_the_category( $post_id ); |
169 | if ( empty( $categories ) ) { |
170 | /** This filter is documented in wp-includes/category-template.php */ |
171 | return apply_filters( 'the_category', __( 'Uncategorized' ), $separator, $parents ); |
172 | } |
173 |
|
174 | $rel = ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) ? 'rel="category tag"' : 'rel="category"'; |
175 |
|
176 | $thelist = ''; |
177 | if ( '' == $separator ) { |
178 | $thelist .= '<ul class="post-categories">'; |
179 | foreach ( $categories as $category ) { |
180 | $thelist .= "\n\t<li>"; |
Line | Code |
225 | * Filter the category or list of categories. |
226 | * |
227 | * @since 1.2.0 |
228 | * |
229 | * @param array $thelist List of categories for the current post. |
230 | * @param string $separator Separator used between the categories. |
231 | * @param string $parents How to display the category parents. Accepts 'multiple', |
232 | * 'single', or empty. |
233 | */ |
234 | return apply_filters( 'the_category', $thelist, $separator, $parents ); |
235 | } |
236 |
|
237 | /** |
238 | * Check if the current post in within any of the given categories. |
239 | * |
240 | * The given categories are checked against the post's categories' term_ids, names and slugs. |
241 | * Categories given as integers will only be checked against the post's categories' term_ids. |
242 | * |
243 | * Prior to v2.5 of WordPress, category names were not supported. |