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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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1168 |
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1169 | /** |
1170 | * Filter the Walker class used when adding nav menu items. |
1171 | * |
1172 | * @since 3.0.0 |
1173 | * |
1174 | * @param string $class The walker class to use. Default 'Walker_Nav_Menu_Edit'. |
1175 | * @param int $menu_id ID of the menu being rendered. |
1176 | */ |
1177 | $walker_class_name = apply_filters( 'wp_edit_nav_menu_walker', 'Walker_Nav_Menu_Edit', $menu_id ); |
1178 |
|
1179 | if ( class_exists( $walker_class_name ) ) |
1180 | $walker = new $walker_class_name; |
1181 | else |
1182 | return new WP_Error( 'menu_walker_not_exist', sprintf( __('The Walker class named <strong>%s</strong> does not exist.'), $walker_class_name ) ); |
1183 |
|
1184 | $some_pending_menu_items = $some_invalid_menu_items = false; |
1185 | foreach( (array) $menu_items as $menu_item ) { |
1186 | if ( isset( $menu_item->post_status ) && 'draft' == $menu_item->post_status ) |