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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 |
|---|---|
| 157 | * @param string $separator Optional, default is empty string. Separator for between the categories. |
| 158 | * @param string $parents Optional. How to display the parents. |
| 159 | * @param int $post_id Optional. Post ID to retrieve categories. |
| 160 | * @return string |
| 161 | */ |
| 162 | function get_the_category_list( $separator = '', $parents='', $post_id = false ) { |
| 163 | global $wp_rewrite; |
| 164 | if ( ! is_object_in_taxonomy( get_post_type( $post_id ), 'category' ) ) { |
| 165 | /** This filter is documented in wp-includes/category-template.php */ |
| 166 | return apply_filters( 'the_category', '', $separator, $parents ); |
| 167 | } |
| 168 | |
| 169 | $categories = get_the_category( $post_id ); |
| 170 | if ( empty( $categories ) ) { |
| 171 | /** This filter is documented in wp-includes/category-template.php */ |
| 172 | return apply_filters( 'the_category', __( 'Uncategorized' ), $separator, $parents ); |
| 173 | } |
| 174 | |
| 175 | $rel = ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) ? 'rel="category tag"' : 'rel="category"'; |
| 176 | |
| 177 | $thelist = ''; |
| 178 | if ( '' == $separator ) { |
| 179 | $thelist .= '<ul class="post-categories">'; |
| 180 | foreach ( $categories as $category ) { |
| 181 | $thelist .= "\n\t<li>"; |
| Line | Code |
| 226 | * Filter the category or list of categories. |
| 227 | * |
| 228 | * @since 1.2.0 |
| 229 | * |
| 230 | * @param array $thelist List of categories for the current post. |
| 231 | * @param string $separator Separator used between the categories. |
| 232 | * @param string $parents How to display the category parents. Accepts 'multiple', |
| 233 | * 'single', or empty. |
| 234 | */ |
| 235 | return apply_filters( 'the_category', $thelist, $separator, $parents ); |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Check if the current post in within any of the given categories. |
| 240 | * |
| 241 | * The given categories are checked against the post's categories' term_ids, names and slugs. |
| 242 | * Categories given as integers will only be checked against the post's categories' term_ids. |
| 243 | * |
| 244 | * Prior to v2.5 of WordPress, category names were not supported. |