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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 |
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135 | /** |
136 | * Filters the categories before building the category list. |
137 | * |
138 | * @since 4.4.0 |
139 | * |
140 | * @param array $categories An array of the post's categories. |
141 | * @param int|bool $post_id ID of the post we're retrieving categories for. When `false`, we assume the |
142 | * current post in the loop. |
143 | */ |
144 | $categories = apply_filters( 'the_category_list', get_the_category( $post_id ), $post_id ); |
145 |
|
146 | if ( empty( $categories ) ) { |
147 | /** This filter is documented in wp-includes/category-template.php */ |
148 | return apply_filters( 'the_category', __( 'Uncategorized' ), $separator, $parents ); |
149 | } |
150 |
|
151 | $rel = ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) ? 'rel="category tag"' : 'rel="category"'; |
152 |
|
153 | $thelist = ''; |