Detailed explanation of the use _php skills of classification function wp_list_categories in WordPress

Wp_list_categories function is used in WordPress to list the classification of the system functions, the function has a lot of control output parameters, today suddenly was asked by a friend, so I probably sorted it out.

Because of the built-in extended gadget features in WordPress,
So we can display a list of categories in the sidebar or wherever we want without any function.
So the wp_list_categories function is rarely used,
The function is somewhat similar to Wp_list_bookmarks,

Wp_list_categories description
the Wp_list_categories function is a function of WordPress to list the classification links in the system.
The original English is not on, interested can go to see the official document.

Usage

<?php wp_list_categories ($args); $args = Array (' Show_option_all ' => ',//whether to list category links ' by ' => ' name ',//' order ' by name ' => ' ASC ',//L , descending ' style ' => ' list ',//whether to use the list (Ul>li) ' Show_count ' => 0,//whether to show the number of articles ' Hide_empty ' => 1,//whether there is no log Category ' Use_desc_for_title ' => 1,//whether to display the category description ' child_of ' => 0,//whether to restrict the subcategory ' feed ' => ',//whether to display RSS ' Feed_ty PE ' => ',//rss type ' feed_image ' => ',//whether to display RSS picture ' Exclude ' => ',//exclude category ID, multiple use ', (English comma) ' delimited ' exclud E_tree ' => ',//excludes the classification tree, that is, the parent category and its sub category ' include ' => ',//Includes the category ' Hierarchical ' => true,//whether to rank the child, parent classification ' TITL E_li ' => __ (' Categories '), the name of the list title ' Show_option_none ' => __ (' no Categories '),//The title ' number ' displayed when no classification > null,//Display the number of categories ' echo ' => 1,//display, display or return string ' depth ' => 0,//level limit ' current_category ' => add Add a no category ' Pad_counts ' => 0,//This I don't understand ' taxonomy ' => ' category ',//using the taxonomy ' walker ' => null//classes for display (very complex concepts)?>
 

As for ' pad_counts ', I don't understand what this parameter is for,
If you are interested you can study the official documentation for this parameter.
You can also compare wp_list_bookmarks to use.

Pad_counts
(Boolean) calculates link or post counts by including the items from the child categories. If show_counts and hierarchical are true this is automatically set to true. This parameter added at Version 2.9 Valid values:
1 (true)
0 (false) –default

Working with instances
Display category links that include ID 3,5,9,16, sorted by name

<ul>
<?php wp_list_categories (' orderby=name&include=3,5,9,16 ');?> 
</ul>

Include a list of categories with ID 5,9,23 that poetry as headings

<ul>
<?php wp_list_categories (' include=5,9,23&title_li= 
 

Of course you can also write parameters as follows, consolidating the parameters into an array.

<?php 
$taxonomy   = ' genre ';
$orderby   = ' name '; 
$show _count  = 0;   1 for Yes, 0 for no
$pad _counts  = 0;   1 for Yes, 0 for no
$hierarchical = 1;   1 for Yes and 0 for no
$title    = ';
 
$args = Array (
 ' taxonomy '   => $taxonomy,
 ' by '   => $orderby,
 ' show_count '  = > $show _count,
 ' pad_counts '  => $pad _counts,
 ' hierarchical ' => $hierarchical,
 ' Title_ Li '   => $title
);
? >
 
<ul>
<?php wp_list_categories ($args);?>
</ul>

The taxonomy taxonomy is relative to the label (tag) concept.