WordPress不用插件实现文章阅读计数及热门文章
作为WordPress使用者,能不使用插件就尽量不安装插件,作为WordPress主题制作者,就更不应该让主题依赖插件了。文章阅读计数和热门文章列表是常见的需求,实现起来其实也并不复杂。
设置文章阅读数量函数:
function bzg_set_post_views() {global $post;if( ! isset( $post->ID ) || ! is_singular() ) return;$cookie_name = 'views_' . $post->ID;if( isset( $_COOKIE[$cookie_name] ) ) return;$post_views = (int) get_post_meta( $post->ID, 'views', true );if( empty( $post_views ) ) {$post_views = 1;} else {$post_views = $post_views + 1;}update_post_meta( $post->ID, 'views', $post_views );setcookie( $cookie_name, 'yes', ( current_time( 'timestamp' ) + 86400 ) );}add_action( 'get_header', 'bzg_set_post_views' );
代码中86400是指同一浏览器访问24小时内不计数,这样就能一定程度上避免刷阅读数。
读取文章阅读数量函数:
function bzg_post_views($post_ID = '') {global $post;$post_id = $post_ID;if( ! $post_id ) $post_id = $post->ID;if( ! $post_id ) return;$post_views = (int) get_post_meta( $post_id, 'views', true );if( empty( $post_views ) ) $post_views = 0;return $post_views;}
以上代码放到主题文件functions.php中,在需要显示文章阅读数的地方调用:
<?php echo bzg_post_views(); ?>
获取阅读数最多的文章:
function bzg_get_most_viewed( $limit = 10 ) {$args = array('posts_per_page' => $limit,'order' => 'DESC','post_status' => 'publish','orderby' => 'meta_value_num','meta_key' => 'views','date_query' => array(array('after' => '-360day',)),);$str = implode('&', $args);$postlist = wp_cache_get('hot_post_' . md5($str), 'beizigen');if(false === $postlist) {$postlist = get_posts( $args );wp_cache_set('hot_post_' . md5($str), $postlist, 'beizigen', 86400);}foreach ( $postlist as $post ) {echo '<li><a href="' . get_permalink($post->ID) . '" rel="bookmark">' . $post->post_title . '</a></li>';}wp_reset_postdata();}
注意函数中的-360day,是指输出360天内的文章,函数调用方法:
<ul><?php bzg_get_most_viewed(8); ?></ul>
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