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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 |
|---|---|
| 149 | /** |
| 150 | * Filters the categories before building the category list. |
| 151 | * |
| 152 | * @since 4.4.0 |
| 153 | * |
| 154 | * @param WP_Term[] $categories An array of the post's categories. |
| 155 | * @param int|false $post_id ID of the post to retrieve categories for. |
| 156 | * When `false`, defaults to the current post in the loop. |
| 157 | */ |
| 158 | $categories = apply_filters( 'the_category_list', get_the_category( $post_id ), $post_id ); |
| 159 | |
| 160 | if ( empty( $categories ) ) { |
| 161 | /** This filter is documented in wp-includes/category-template.php */ |
| 162 | return apply_filters( 'the_category', __( 'Uncategorized' ), $separator, $parents ); |
| 163 | } |
| 164 | |
| 165 | $rel = ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) ? 'rel="category tag"' : 'rel="category"'; |
| 166 | |
| 167 | $thelist = ''; |