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PHP study notes (4): php study notes. PHP learning notes (4): some functions in the Wordpress framework of php learning notes: wp_get_nav_menu ($ default): obtain the menu according to the condition $ default, by default, all menus are obtained, including $ d PHP learning notes (4) and php learning notes.

Some functions in the Wordpress framework:

Wp_get_nav_menu ($ default ):Obtain menus based on the condition $ default. all menus are obtained by default.

$ Default is shown as follows by default:

$default = array(  ‘theme_location’ =>'',  'menu' =>'',  'container' =>'p',  'container_class' => 'menu-{menu_slug}-container',  'container_id' =>'',  'menu_class'=>'menu',  'echo' => true,  'fallback_cb'=>'wp_page_menu',  'before' =>'',  'after' =>'',  'link_before' =>'',  'link_after' =>'',  'items_wrap' =>'
 
 

  
  %3$s
 
 
,  'depth' =>0,  'walker' =>'');

Parameter description:

$ Theme_location: The default value is none. it specifies a registered navigation menu. if not specified, the first menu is displayed. Such as primary and secondary

$ Menu: the default value is none. you can use the name of the navigation menu to call the menu.

$ Container: The default value is p, which is the parent node of ul. only the p and nav labels are supported. you can also use false to remove the ul parent node label.

$ Container_class: The default value is menu-{menu_slug}-container, which is the class attribute of the ul parent node.

$ Container_id: The default value is none. id of the ul parent node

$ Menu_class: default value: menu, class attribute of ul node

$ Menu_id: The default value is menu slug. the id attribute value of the self-increasing ul node

$ Echo: The default value is true. if you want to use the code of the navigation as skin type, you can set it to false.

$ Fallback_db: The default value is wp_page_menu, which is a callback function called when navigation is not set in the background.

$ Items_wrap: The default value is none. replace ul's class with string modification.

$ Depth: The default value is 0. the hierarchical depth of the menu is displayed. if the value is 0, all menus in depth are displayed.

$ Walker: by default, new Walker_Nav_Menu () is used to customize the traversal object and call a Walker subclass object to define the display navigation menu.

Use the Walker subclass to create a custom menu:

The Walker class is an abstract class that defines how to display navigation and so on. this abstract class contains four attributes and six methods:

Attribute:

$ Tree_type, $ db_fields, $ max_pages, $ has_children

Method:

Start_lvl: This method is executed when the Walker class reaches the top level of the structure and can be used to output the start element.

End_lvl: disable element labels output by start_lvl.

Start_el: outputs a start label for each element.

End_el: disable the start_el label.

(Core) display_element: defines how to display elements in a tree structure

(Core) the walk uses $ max_depth to cycle every element in the tree structure.

If you need to customize the navigation, you can directly write a class to inherit Walker, but in this way, you need to override all methods. If the modification is not large, you can directly inherit the Walker_NAV_Menu class and rewrite the class to be modified.

When you override display_element, the parameter $ element contains all information about the elements Currently traversed. for example, you can use $ element-> object_id to obtain the term_id of the current element.

Code snippet: using add_shorcode ('name', 'function _ name'), you can generate a code snippet ['name'] in the system, which can be directly used in wordpress background articles, or use show_domaincode ['[name]'] in the code to directly execute

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