PHP Learning Note (iv), PHP learning Note _php Tutorial

PHP Learning Notes (iv), PHP learning notes

Some functions in the Wordpress framework:

Wp_get_nav_menu ($default): gets the menu according to the condition $default, by default gets all the menu

where $default default is as follows:

$default Array (  = = ',  ' menu ' = = ', '  container ' = ' div ',  ' container_class ' = ' menu-{menu_ ') Slug}-container ',  ' container_id ' = ' and ',  ' menu_class ' = ' menu ',  true,  ' fallback _CB ' + ' wp_page_menu ', ' before ' + ', ' after  ' = ', '  link_before ' =  ', ' link_ After ' = = ',  ' items_wrap ' + '
 
  
  

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

Description of the parameter:

$theme _location: Default is None, specifies that one of the navigation menus is registered, and if not specified, the first one is displayed. such as primary, secondary, etc.

$menu: The default is None, use the name of the navigation menu to invoke the menu, you can make term_id, slug, name and other properties

$container: The default is Div, is the parent node of UL, only support Div and nav tag, also can use false to remove the label of the UL parent node

$container _class: Default is Menu-{menu_slug}-container, which is the class property of the UL parent node

$container _id: Default is None, the ID of the UL parent node

$menu _class: The default is menu, the Class property of the UL node

$menu _id: Default is menu slug, self-growing UL Node id attribute value

$echo: The default is true to determine the direct display of the navigation menu Korean return HTML fragment, if you want to use the navigation code as a skin, you can set to false.

$fallback _db: The default value is Wp_page_menu for callback functions that do not have a navigation Si cho set in the background

$items _wrap: Default is None, use string modification to replace UL class

$depth: Defaults to 0, displays the menu's level depth, and displays a menu of all depths for 0 o'clock

$walker: The default is to use new Walker_nav_menu (), a custom traversal object, to invoke a Walker subclass object definition to display the navigation menu.

Use the Walker subclass to create a custom menu:

The Walker class is an abstract class that defines how navigation is displayed, including 4 properties and 6 methods:

Property:

$tree _type, $db _fields, $max _pages, $has _children

Method:

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

END_LVL: Turn off element labels for START_LVL output

Start_el: Output a start tag for each element

End_el: Turn off the Start_el label

(CORE) Display_element: Defines how to display elements in a tree structure

(core) walk each element in a circular tree structure, based on the $max_depth

If you need custom navigation, you can simply write a class class to inherit Walker, but this overrides all methods. If the changes are not significant, you can directly inherit the Walker_nav_menu class, overriding the classes that need to be modified.

When overriding Display_element, the parameter $element contains all the information for the element that is currently traversed, such as the term_id of the current element can be obtained with $element->object_id

Code snippet: Use Add_shorcode (' name ', ' function_name ') to generate a code snippet [' name '] in the system, which can be used directly in WordPress background articles, or in code Show_shortcode [' [name] ']; Direct execution

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