<?php
/**
 * 文章浏览量统计功能
 */

// 防止直接访问
if (!defined('ABSPATH')) {
    exit;
}

/**
 * 获取文章浏览量
 * 
 * @param int $postID 文章ID
 * @return string 浏览量
 */
function nenghui_get_post_views($postID) {
    $count_key = 'post_views_count';
    $count = get_post_meta($postID, $count_key, true);
    if ($count == '') {
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, '0');
        return "0";
    }
    return $count;
}

/**
 * 设置/增加文章浏览量
 * 
 * @param int $postID 文章ID
 */
function nenghui_set_post_views($postID) {
    $count_key = 'post_views_count';
    $count = get_post_meta($postID, $count_key, true);
    if ($count == '') {
        $count = 0;
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, '1');
    } else {
        $count++;
        update_post_meta($postID, $count_key, $count);
    }
}

/**
 * 自动增加浏览量（当访问文章详情页时）
 */
function nenghui_track_post_views() {
    if (is_single()) {
        global $post;
        if (isset($post->ID)) {
            nenghui_set_post_views($post->ID);
        }
    }
}
add_action('wp_head', 'nenghui_track_post_views');

/**
 * 在后台文章列表显示浏览量列
 */
function nenghui_posts_column_views($defaults) {
    $defaults['post_views'] = '浏览量';
    return $defaults;
}
add_filter('manage_posts_columns', 'nenghui_posts_column_views');

function nenghui_posts_custom_column_views($column_name, $id) {
    if ($column_name === 'post_views') {
        echo nenghui_get_post_views($id);
    }
}
add_action('manage_posts_custom_column', 'nenghui_posts_custom_column_views', 10, 2);