自动从其它站点RSS抓取文章

代码基本原理，新建一个自定义分类法“shot”，自动从另一个站点的RSS抓取文章，放在一个数组中，再用这个数组创建“shot”文章，并为文章添加自定义栏目image和link_url，方便调用缩略图和原文链接。

将下面代码添加到当前主题functions.php中即可。

<?
/* Post Type
   ------------------------------------------------------------------------------------ */
add_action( 'init', 'register_cpt_shot' );
function register_cpt_shot() {
    $labels = array(
        'name' => _x( 'Dribble Shots', 'shot' ),
        'singular_name' => _x( 'Dribbble Shot', 'shot' ),
        'add_new' => _x( 'Add New', 'shot' ),
        'add_new_item' => _x( 'Add New Dribbble Shot', 'shot' ),
        'edit_item' => _x( 'Edit Dribbble Shot', 'shot' ),
        'new_item' => _x( 'New Dribbble Shot', 'shot' ),
        'view_item' => _x( 'View Dribbble Shot', 'shot' ),
        'search_items' => _x( 'Search Dribble Shots', 'shot' ),
        'not_found' => _x( 'No dribble shots found', 'shot' ),
        'not_found_in_trash' => _x( 'No dribble shots found in Trash', 'shot' ),
        'parent_item_colon' => _x( 'Parent Dribbble Shot:', 'shot' ),
        'menu_name' => _x( 'Dribble Shots', 'shot' ),
    );
    $args = array(
        'labels' => $labels,
        'hierarchical' => false,
        'supports' => array( 'title', 'custom-fields' ),
        'public' => true,
        'show_ui' => true,
        'show_in_menu' => true,
        'show_in_nav_menus' => false,
        'publicly_queryable' => true,
        'exclude_from_search' => false,
        'has_archive' => true,
        'query_var' => true,
        'can_export' => true,
        'rewrite' => true,
        'capability_type' => 'post'
    );
    register_post_type( 'shot', $args );
}
/* Import Shots via RSS
   ------------------------------------------------------------------------------------ */
// grab the image src from teh description
function get_image($string) {
    preg_match_all('/<img[^>]+>/i',$string, $result);
    $img = array();
    foreach( $result[0] as $img_tag)
    {
        preg_match_all('/(src)=("[^"]*")/i',$img_tag, $img[$img_tag]);
    }
    return trim($img[$img_tag][2][0], '"');
}
// create an array of the feed items
include_once(ABSPATH . WPINC . '/feed.php');
$feed = fetch_feed('http://123.com/tammyhart/shots.rss');
$feed = $feed->get_items(0);
$shots = array();
foreach ( $feed as $item ) :
$shots[$item->get_date('Ymd')] = array(
    'id'    => $item->get_date('Ymd'),
    'url'   => esc_url( $item->get_permalink() ),
    'date'  => $item->get_date('Y-m-d H:i:s'),
    'title' => esc_html( $item->get_title() ),
    'image' => get_image($item->get_description())
    );
endforeach;
// create posts from our array
foreach ($shots as $shot) {
    $shot_post = array(
        'post_type'     => 'shot',
        'post_status'   => 'publish',
        'post_author'   => 1,
        'post_title'    => $shot['title'],
        'post_date'     => $shot['date']
        );
    $shot_post_meta = array(
        'link_url'  => $shot['url'],
        'image'     => $shot['image']
        );
    $posts = get_posts(
        array(
            'post_type' => 'shot',
            'meta_key'  => 'link_url',
            'meta_value'=> $shot_post_meta['link_url']
            )
        );
    if (count($posts) == 0) {
        $post_id = wp_insert_post($shot_post);
        add_post_meta($post_id, 'link_url', $shot_post_meta['link_url'], true);
        add_post_meta($post_id, 'image', $shot_post_meta['image'], true);
    }
}
?>

修改第66行的”http://123.com/tammyhart/shots.rss“为准备抓取文章站点的RSS地址，还可以修改第80行后的”shot“为你所用主题自定义分类法名称，抓取的文章会自动添加到该分类法中。

上述代码中并没有抓取文章内容的功能，仅供参考学习之用。