WordPress正文添加您最近看过的功能

/* 可选参数: */
$zg_cookie_expire = 360; // cookie过期时间，默认值是360天
$zg_number_of_posts = 10; // 显示篇数，默认值是10。
$zg_recognize_pages = true;
 
/* 此行后不要编辑 */
function zg_lwp_header() {
    if (is_single()) {
        zg_lw_setcookie();
    } else if (is_page()) {
        global $zg_recognize_pages;
        if ($zg_recognize_pages === true) {
            zg_lw_setcookie();
        }
    }
}
 
function zg_lw_setcookie() {
    global $wp_query;
    $zg_post_ID = $wp_query->post->ID;
    if (! isset($_COOKIE["WP-LastViewedPosts-coding3min"])) {
        $zg_cookiearray = array($zg_post_ID);
    } else {
        $zg_cookiearray = unserialize(stripslashes($_COOKIE["WP-LastViewedPosts-coding3min"]));
        if (! is_array($zg_cookiearray)) {
            $zg_cookiearray = array($zg_post_ID);
        }
    }
    if (in_array($zg_post_ID, $zg_cookiearray)) {
        $zg_key = array_search($zg_post_ID, $zg_cookiearray);
        array_splice($zg_cookiearray, $zg_key, 1);
    }
    array_unshift($zg_cookiearray, $zg_post_ID);
    global $zg_number_of_posts;
    while (count($zg_cookiearray) > $zg_number_of_posts) {
        array_pop($zg_cookiearray);
    }
    $zg_blog_url_array = parse_url(get_bloginfo('url'));
    $zg_blog_url = $zg_blog_url_array['host'];
    $zg_blog_url = str_replace('www.', '', $zg_blog_url);
    $zg_blog_url_dot = '.';
    $zg_blog_url_dot .= $zg_blog_url;
    $zg_path_url = $zg_blog_url_array['path'];
    $zg_path_url_slash = '/';
    $zg_path_url .= $zg_path_url_slash;
    global $zg_cookie_expire;
    setcookie("WP-LastViewedPosts-coding3min", serialize($zg_cookiearray), (time()+($zg_cookie_expire*86400)), $zg_path_url, $zg_blog_url_dot, 0);
}
 
function zg_recently_viewed() {
    echo '<ul class="viewed_posts">';
    if (isset($_COOKIE["WP-LastViewedPosts-coding3min"])) {
        $zg_post_IDs = unserialize(stripslashes($_COOKIE["WP-LastViewedPosts-coding3min"]));
        foreach ($zg_post_IDs as $value) {
            global $wpdb;
            $zg_get_title = $wpdb->get_results("SELECT post_title FROM $wpdb->posts WHERE ID = '$value+0' LIMIT 1");
            foreach($zg_get_title as $zg_title_out) {
                echo "<li><a href=\"". get_permalink($value+0) . "\" title=\"". $zg_title_out->post_title . "\">". $zg_title_out->post_title . "</a></li>\n";
            }
        }
    } else {
    }
    echo '</ul>';
}
 
add_action('get_header','zg_lwp_header');