wordpress首页只显示某个分类的文章/插件实现（完美实现）
--------------------------------------------插件源码----------------------------------------------------------------
<?php
/*
Plugin Name: Front Page Included-only Categories
Version: 0.2
Plugin URI:
Description: This version uses a comma separated list of *included* category ids.
Author: fengyqf
Author URI: http://www.path8.net/
*/
function fpe_where($where) {
// Change the $cats_to_include string to the category id you do not want to appear on the front page.
// Example: $cats_to_include = '1, 2, 3, 4';
$cats_to_include = '22, 26';
global $wpdb, $wp_query;
if (! $wp_query->is_home || strlen($cats_to_include) == 0) {
return $where;
}
if (empty($wpdb->term_relationships))
{
$where .= " AND $wpdb->post2cat.category_id IN (" . $cats_to_include . ")";
}
else
{
$where .= " AND $wpdb->term_taxonomy.term_id IN (" . $cats_to_include . ")";
}
return $where;
}
function fpe_join($join) {
global $wpdb, $wp_query;
if (!$wp_query->is_home) {
return $join;
}
if (empty($wpdb->term_relationships))
{
$join .= " LEFT JOIN $wpdb->post2cat ON $wpdb->post2cat.post_id = $wpdb->posts.ID ";
}
else
{
if (!preg_match("/$wpdb->term_relationships/i",$join))
{
$join .=" LEFT JOIN $wpdb->term_relationships ON ($wpdb->posts.ID = $wpdb->term_relationships.object_id) ";
}
if (!preg_match("/$wpdb->term_taxonomy/i",$join))
{
$join .=" LEFT JOIN $wpdb->term_taxonomy ON $wpdb->term_taxonomy.term_taxonomy_id = $wpdb->term_relationships.term_taxonomy_id";
}
}
return $join;
}
function fpe_distinct($distinct) {
global $wp_query;
if (! $wp_query->is_home ) {
return $distinct;
}
return "distinct";
}
add_filter('posts_join', 'fpe_join');
add_filter('posts_where', 'fpe_where');
add_filter('posts_distinct', 'fpe_distinct');
?>
-----------------------------------------插件源码 end-------------------------------------------------------------------
简介：
该插件是一个wordpress插件 Front Page Excluded Categories基本上稍做修改而成，在此感谢前人的工作。
使用方法：
1. 安装，就是wordpress插件安装，这里就不用说了。
2. 配置，该插件没有管理界面，直接编辑源代码进行配置，需要编辑修改的只有如下的一行。
$cats_to_include = '22, 26';
该行在上面源码中已经标红，等号右边是一个引号括起来的以逗号分隔的数字，可以有一个或者多个，我在这里配置了两个22与26。数字即是需要显示在首页分类的id编号，该数字可以在wordpress后台的编辑“文章分类目录”、编辑分类时，在浏览器地址栏url里查看到。
原理：
只要简单的懂得一点php/mysql程序知识，比较一个这里的代码与Front Page Excluded Categories的差异部分（上面代码里已经标绿）就明白了。