Detailed explanation of the use of classification function wp_list_categories in WordPress, wplistcategories_PHP tutorial

Detailed explanation of the use of classification function wp_list_categories in WordPress, wplistcategories

wp_list_categories function is a function in WordPress used to list categories in the system. This function has many parameters that control the output. Suddenly today I was asked by a friend, so I sorted it out.

Because of the extended widget functionality built into WordPress,
So we can display a category list in the sidebar or other location we want without using any function,
Therefore, the wp_list_categories function is rarely used,
This function is somewhat similar to wp_list_bookmarks,

wp_list_categories Description
The wp_list_categories function is a function used in WordPress to list category links in the system.
The original English text is not available. If you are interested, you can read the official documentation.

Usage

<&#63;php
 wp_list_categories( $args ); 
$args = array(
 'show_option_all'  => '',//是否列出分类链接
 'orderby'      => 'name',//按名称排列
 'order'       => 'ASC',//升、降序
 'style'       => 'list',//是否用列表（ul>li）
 'show_count'     => 0,//是否显示文章数量
 'hide_empty'     => 1,//是否显示无日志分类
 'use_desc_for_title' => 1,//是否显示分类描述
 'child_of'      => 0,//是否限制子分类
 'feed'        => '',//是否显示rss
 'feed_type'     => '',//rss类型
 'feed_image'     => '',//是否显示rss图片
 'exclude'      => '',//排除分类的ID，多个用',（英文逗号）'分隔
 'exclude_tree'    => '',//排除分类树，即父分类及其下的子分类
 'include'      => '',//包括的分类
 'hierarchical'    => true,//是否将子、父分类分级
 'title_li'      => __( 'Categories' ),//列表标题的名称
 'show_option_none'  => __('No categories'),//无分类时显示的标题
 'number'       => null,//显示分类的数量
 'echo'        => 1,//是否显示，显示或者返回字符串
 'depth'       => 0,//层级限制
 'current_category'  => 0,//添加一个没有的分类
 'pad_counts'     => 0,//这个我也不明白
 'taxonomy'      => 'category',//使用的分类法
 'walker'       => null//用于显示的类（很复杂的概念）
&#63;>

Regarding 'pad_counts', I don't understand what this parameter is used for,
If you are interested, you can study the official documentation of this parameter.
You can also check wp_list_bookmarks to use it.

pad_counts
(boolean) Calculates link or post counts by including items from 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

Usage examples
The display includes category links with IDs 3, 5, 9, and 16, sorted by name

<ul>
<&#63;php wp_list_categories('orderby=name&include=3,5,9,16'); &#63;> 
</ul>

Display the category list with IDs 5, 9, and 23 titled Poetry

<ul>
<&#63;php wp_list_categories('include=5,9,23&title_li=<h2>' . __('Poetry') . '</h2>' ); &#63;> 
</ul>

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

<&#63;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, 0 for no
$title    = '';
 
$args = array(
 'taxonomy'   => $taxonomy,
 'orderby'   => $orderby,
 'show_count'  => $show_count,
 'pad_counts'  => $pad_counts,
 'hierarchical' => $hierarchical,
 'title_li'   => $title
);
&#63;>
 
<ul>
<&#63;php wp_list_categories( $args ); &#63;>
</ul>

Taxonomy classification is a concept relative to tags.

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