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
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' => __( '短链接' ),
                    'singular_name' => __( 'URL' ),
                    'add_new' => __( '添加链接' ),
                    'add_new_item' => __( '新建URL' ),
                    'edit' => __( '编辑' ),
                    'edit_item' => __( '编辑 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短链接的栏目

记得要设置一下固定链接去保存一下哦！