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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 |
|---|---|
| 214 | * Filters the HTML list content for a specific navigation menu. |
| 215 | * |
| 216 | * @since 3.0.0 |
| 217 | * |
| 218 | * @see wp_nav_menu() |
| 219 | * |
| 220 | * @param string $items The HTML list content for the menu items. |
| 221 | * @param object $args An object containing wp_nav_menu() arguments. |
| 222 | */ |
| 223 | $items = apply_filters( "wp_nav_menu_{$menu->slug}_items", $items, $args ); |
| 224 | |
| 225 | // Don't print any markup if there are no items at this point. |
| 226 | if ( empty( $items ) ) |
| 227 | return false; |
| 228 | |
| 229 | $nav_menu .= sprintf( $args->items_wrap, esc_attr( $wrap_id ), esc_attr( $wrap_class ), $items ); |
| 230 | unset( $items ); |
| 231 | |
| 232 | if ( $show_container ) |