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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 |
|---|---|
| 143 | * |
| 144 | * @see wp_list_pages() |
| 145 | * |
| 146 | * @param string[] $css_class An array of CSS classes to be applied to each list item. |
| 147 | * @param WP_Post $page Page data object. |
| 148 | * @param int $depth Depth of page, used for padding. |
| 149 | * @param array $args An array of arguments. |
| 150 | * @param int $current_page ID of the current page. |
| 151 | */ |
| 152 | $css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page ) ); |
| 153 | $css_classes = $css_classes ? ' class="' . esc_attr( $css_classes ) . '"' : ''; |
| 154 | |
| 155 | if ( '' === $page->post_title ) { |
| 156 | /* translators: %d: ID of a post. */ |
| 157 | $page->post_title = sprintf( __( '#%d (no title)' ), $page->ID ); |
| 158 | } |
| 159 | |
| 160 | $args['link_before'] = empty( $args['link_before'] ) ? '' : $args['link_before']; |
| 161 | $args['link_after'] = empty( $args['link_after'] ) ? '' : $args['link_after']; |