通过修改源码，免插件实现wordpress去除链接中的category

将以下代码加在主题目录的functions.php

/**
 * 去除category
 */
add_action('load-themes.php', 'no_category_base_refresh_rules');
add_action('created_category','no_category_base_refresh_rules');
add_action('edited_category','no_category_base_refresh_rules');
add_action('delete_category','no_category_base_refresh_rules');
    function no_category_base_refresh_rules(){
        global $wp_rewrite;
        $wp_rewrite->flush_rules();
    }
// register_deactivation_hook(__FILE__, 'no_category_base_deactivate');
// function no_category_base_deactivate() {
// remove_filter('category_rewrite_rules', 'no_category_base_rewrite_rules');
// // We don't want to insert our custom rules again
// no_category_base_refresh_rules();
// }
// Remove category base
add_action('init','no_category_base_permastruct');
function no_category_base_permastruct(){
     global$wp_rewrite,$wp_version;
     if(version_compare($wp_version,'3.4','<')){
         // For pre-3.4 support
         $wp_rewrite->extra_permastructs['category'][0]='%category%';
     }else{
         $wp_rewrite->extra_permastructs['category']['struct']='%category%';
     }
}
// Add our custom category rewrite rules
add_filter('category_rewrite_rules','no_category_base_rewrite_rules');
function no_category_base_rewrite_rules($category_rewrite){
    //var_dump($category_rewrite); // For Debugging
    $category_rewrite=array();
    $categories=get_categories(array('hide_empty'=>false));
     foreach($categories as $category){
         $category_nicename=$category->slug;
         if($category->parent==$category->cat_ID)// recursive recursion
             $category->parent=0;
         elseif($category->parent!=0)
             $category_nicename=get_category_parents($category->parent,false,'/',true).$category_nicename;
         $category_rewrite['('.$category_nicename.')/(?:feed/)?(feed|rdf|rss|rss2|atom)/?$']='index.php?category_name=$matches[1]&feed=$matches[2]';
         $category_rewrite['('.$category_nicename.')/page/?([0-9]{1,})/?$']='index.php?category_name=$matches[1]&paged=$matches[2]';
         $category_rewrite['('.$category_nicename.')/?$']='index.php?category_name=$matches[1]';
     }
 // Redirect support from Old Category Base
 global $wp_rewrite;
 $old_category_base=get_option('category_base')?get_option('category_base'):'category';
 $old_category_base=trim($old_category_base,'/');
 $category_rewrite[$old_category_base.'/(.*)$']='index.php?category_redirect=$matches[1]';

 //var_dump($category_rewrite); // For Debugging
 return $category_rewrite;
}

// Add 'category_redirect' query variable
add_filter('query_vars','no_category_base_query_vars');
function no_category_base_query_vars($public_query_vars){
    $public_query_vars[]='category_redirect';
    return $public_query_vars;
}

// Redirect if 'category_redirect' is set
add_filter('request','no_category_base_request');
function no_category_base_request($query_vars){
    //print_r($query_vars); // For Debugging
 if(isset($query_vars['category_redirect'])){
     $catlink=trailingslashit(get_option('home')).user_trailingslashit($query_vars['category_redirect'],'category');
     status_header(301);
     header("Location: $catlink");
     exit();
 }
 return $query_vars;
}