米莎·鲁德拉斯特伊是一个很好的向导，你可以跟随here, 我也将在这里包括相关代码。

/*
* Display number of shares using WordPress HTTP API
*
* @param integer $post_id We want to get number of shares of the post with this ID
*/
function wp_get_shares( $post_id ) {
    $cache_key = \'misha_share\' . $post_id;
    $access_token = \'APP_ID|APP_SECRET\';
    $count = get_transient( $cache_key ); // try to get value from Wordpress cache

    // If no value in the cache
    if ( $count === false ) {
        $response = wp_remote_get(\'https://graph.facebook.com/v2.7/?id=\' . urlencode( get_permalink( $post_id ) ) . \'&access_token=\' . $access_token );
        $body = json_decode( $response[\'body\'] );     
        $count = intval( $body->share->share_count );
        set_transient( $cache_key, $count, 3600 ); // store value in cache for 1 hour
    }
    return $count;
}