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。

!

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