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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 |
|---|---|
| 136 | */ |
| 137 | function wp_nav_menu( $args = array() ) { |
| 138 | static $menu_id_slugs = array(); |
| 139 | |
| 140 | $defaults = array( 'menu' => '', 'container' => 'div', 'container_class' => '', 'container_id' => '', 'menu_class' => 'menu', 'menu_id' => '', |
| 141 | 'echo' => true, 'fallback_cb' => 'wp_page_menu', 'before' => '', 'after' => '', 'link_before' => '', 'link_after' => '', 'items_wrap' => '<ul id="%1$s" class="%2$s">%3$s</ul>', |
| 142 | 'depth' => 0, 'walker' => '', 'theme_location' => '' ); |
| 143 | |
| 144 | $args = wp_parse_args( $args, $defaults ); |
| 145 | $args = apply_filters( 'wp_nav_menu_args', $args ); |
| 146 | $args = (object) $args; |
| 147 | |
| 148 | // Get the nav menu based on the requested menu |
| 149 | $menu = wp_get_nav_menu_object( $args->menu ); |
| 150 | |
| 151 | // Get the nav menu based on the theme_location |
| 152 | if ( ! $menu && $args->theme_location && ( $locations = get_nav_menu_locations() ) && isset( $locations[ $args->theme_location ] ) ) |
| 153 | $menu = wp_get_nav_menu_object( $locations[ $args->theme_location ] ); |
| 154 | |