纯代码实现WordPress插件simple-urls短网址跳转功能

我们的wordpress网站在发展过程中，会添加很多外部链接，比如我们自己的广告外链，网站预览外链，如果时间长了太多的跳出外链可能会导致网站分权，百度权重降低。我们可以用go跳转方法强制将外链转换为我们的内链，在此给大家推荐一款插件：simple-urls
当然我比较喜欢用代码来实现,不喜欢装太多插件.下面来分享下代码
打开主题的functions.php文件,插入以下代码即可

// 代码实现短网址功能-vlwx.com  class SimpleURLs {      // Constructor      function __construct() {          //register_activation_hook( __FILE__, 'flush_rewrite_rules' );          add_action( 'init', array( &$this, 'register_post_type' ) );          add_action( 'manage_posts_custom_column', array( &$this, 'columns_data' ) );          add_filter( 'manage_edit-surl_columns', array( &$this, 'columns_filter' ) );          add_action( 'admin_menu', array( &$this, 'add_meta_box' ) );          add_action( 'save_post', array( &$this, 'meta_box_save' ), 1, 2 );          add_action( 'template_redirect', array( &$this, 'count_and_redirect' ) );      }      // PHP4 Constructor      function SimpleURLs() {          $this->__construct();      }      function register_post_type() {          register_post_type( 'surl',              array(                  'labels' => array(                      'name' => __( 'Simple URLs' ),                      'singular_name' => __( 'URL' ),                      'add_new' => __( 'Add URL' ),                      'add_new_item' => __( '新建URL' ),                      'edit' => __( 'Edit' ),                      'edit_item' => __( 'Edit URL' ),                      'new_item' => __( 'New URL' ),                      'view' => __( 'View URL' ),                      'view_item' => __( 'View URL' ),                      'search_items' => __( 'Search URL' ),                      'not_found' => __( 'No URLs found' ),                      'not_found_in_trash' => __( '' )                  ),                  'public' => true,                  'query_var' => true,                  'menu_position' => 20,                  'supports' => array( 'title' ),                  'rewrite' => array( 'slug' => 'go', 'with_front' => false )              )          );      }      function columns_filter( $columns ) {          $columns = array(              'cb' => '<input type="checkbox" />',              'title' => __('标题'),              'url' => __('原地址'),              'permalink' => __('短地址'),              'clicks' => __('点击量')          );          return $columns;      }      function columns_data( $column ) {          global $post;          $url = get_post_meta($post->ID, '_surl_redirect', true);          $count = get_post_meta($post->ID, '_surl_count', true);          if ( $column == 'url' ) {              echo make_clickable( esc_url( $url ? $url : '' ) );          }          elseif ( $column == 'permalink' ) {              echo make_clickable( get_permalink() );          }          elseif ( $column == 'clicks' ) {              echo esc_html( $count ? $count : 0 );          }      }      function add_meta_box() {          add_meta_box('surl', __('URL信息', 'surl'), array( &$this, 'meta_box' ), 'surl', 'normal', 'high');      }      function meta_box() {          global $post;          printf( '<input type="hidden" name="_surl_nonce" value="%s" />', wp_create_nonce( plugin_basename(__FILE__) ) );          printf( '<p><label for="%s">%s</label></p>', '_surl_redirect', __('URL原链接地址：', 'surl') );          printf( '<p><input style="%s" type="text" name="%s" id="%s" value="%s" /></p>', 'width: 99%;', '_surl_redirect', '_surl_redirect', esc_attr( get_post_meta( $post->ID, '_surl_redirect', true ) ) );          $count = isset( $post->ID ) ? get_post_meta($post->ID, '_surl_count', true) : 0;          printf( '<p>此链接已经被点击 <b>%d</b> 次.', esc_attr( $count ) );      }      function meta_box_save( $post_id, $post ) {          $key = '_surl_redirect';          //  verify the nonce          if ( !isset($_POST['_surl_nonce']) || !wp_verify_nonce( $_POST['_surl_nonce'], plugin_basename(__FILE__) ) )              return;          //  don't try to save the data under autosave, ajax, or future post.          if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) return;          if ( defined('DOING_AJAX') && DOING_AJAX ) return;          if ( defined('DOING_CRON') && DOING_CRON ) return;          //  is the user allowed to edit the URL?          if ( ! current_user_can( 'edit_posts' ) || $post->post_type != 'surl' )              return;          $value = isset( $_POST[$key] ) ? $_POST[$key] : '';          if ( $value ) {              //  save/update              update_post_meta($post->ID, $key, $value);          } else {              //  delete if blank              delete_post_meta($post->ID, $key);          }      }      function count_and_redirect() {          if ( !is_singular('surl') )              return;          global $wp_query;          // Update the count          $count = isset( $wp_query->post->ID ) ? get_post_meta($wp_query->post->ID, '_surl_count', true) : 0;          update_post_meta( $wp_query->post->ID, '_surl_count', $count + 1 );          // Handle the redirect          $redirect = isset( $wp_query->post->ID ) ? get_post_meta($wp_query->post->ID, '_surl_redirect', true) : '';          if ( !empty( $redirect ) ) {              wp_redirect( esc_url_raw( $redirect ), 301);              exit;          }          else {              wp_redirect( home_url(), 302 );              exit;          }      }  }  $SimpleURLs = new SimpleURLs;  // 代码实现短网址功能

然后打开后台,是不是发现多了一个sinmple Urls的栏目