当我开发这个小插件时，我使用了Danny van Kooten\'s插件：\'Recent Facebook Posts\'.插件文件夹的内容是：

classes /
    facebook-php-sdk/
        base_facebook.php
        facebook.php
        fb_ca_chain_bundle.crt
    class-fcwpc.php
fbconnect_wordpress_comments.php

fbconnect_wordpress_comments.php:

<?php
/*
Plugin Name: FB Connect WP Comments
Description: Allow people to comment if they are Facebook connected.
Version: 1.0
*/

require_once dirname(__FILE__) . \'/classes/class-fcwpc.php\';

$FBWPC = FBWPC::get_instance();
?>

class-fcwpc.php:

<?php

class FBWPC {

    private static $instance;
    private static $fb_instance;
    private $options;

    public static function get_instance() {
        if(!self::$instance) self::$instance = new FBWPC();
        return self::$instance;
    }

    public function __construct() {

        add_action(\'init\', array($this, \'on_init\'));

        add_action( \'comment_post\', array($this, \'save_comment_data\') ); 

        add_shortcode(\'fbconnect-wp-comments\', array($this, \'shortcode_output\'));
    }

    public function on_init() {
        if(!session_id() && !headers_sent()) {
            session_start();
        }
    }

    public function get_options() {
        if(!$this->options) {

            $defaults = array(
                \'app_id\' => get_option( \'appId\' ),
                \'app_secret\' => get_option( \'secret\' )
                );

            $this->options = $defaults;
        }
        return $this->options;
    }

    public function getFBApi() {
        if(!self::$fb_instance) {

            // Only load Facebook class if it has not been loaded yet
            // Other plugins may have loaded the class already at this point.
            if(!class_exists("Facebook")) {
                require_once dirname(__FILE__) . \'/facebook-php-sdk/facebook.php\';
            }

            $opts = $this->get_options();

            self::$fb_instance = new Facebook(array(
                \'appId\' => trim($opts[\'app_id\']),
                \'secret\' => trim($opts[\'app_secret\']),
                ));
        }

        return self::$fb_instance;
    }

    public function get_session() {

        $fb = $this->getFBApi();

        $session = $fb->getUser();
        return $session;
    }

    public function save_comment_data( $comment_id ) {  
        $fb = $this->getFBApi();
        // I need this data to display the profil picture thanks to the url : http://graph.facebook.com/\'. $fb_username .\'/picture
        add_comment_meta( $comment_id, \'fb_username\', $_POST[\'fb_username\'] );

        // test message
        if( isset($_POST[\'publish\']) ){
            $params = array(
                          \'message\'       =>  "Hurray! This works :)",
                          \'name\'          =>  "This is my title",
                          \'caption\'       =>  "My Caption",
                          \'description\'   =>  "Some Description...",
                          \'link\'          =>  "http://stackoverflow.com",
                          \'picture\'       =>  "http://i.imgur.com/VUBz8.png",
                      );
            $user = $_POST[\'fb_userid\'];
            $post = $fb->api("/$user/feed","POST",$params);
        }
    }

    public function shortcode_output()
    {

        $session = $this->get_session();
        $fb = $this->getFBApi();
        if(!$session){
          $loginUrl = $fb->getLoginUrl(array(\'scope\'=>\'publish_stream, email\', \'redirect_uri\'=>\'http://yourRedirectUri.com/\'));
        }

        if( !isset( $session ) || empty( $session ) ){  
            $output = \'<div class="btns">
                <div class="fb-connect">
                    <a href="\'. $loginUrl. \'"><img src="\'. get_template_directory_uri(). \'/img/btn-fb.png" alt=""></a>
                </div>
            </div>\';
        }

        $output .= \'<ul>\';
        if( $nb_coms != 0 ){

            $comments = get_comments();
            foreach($comments as $comment) :
                $fb_username = get_comment_meta( $comment->comment_ID, \'fb_username\', true );
                $output .=  \'<li id="list-comment-\'. $comment->comment_ID .\'">
                <img src="http://graph.facebook.com/\'. $fb_username .\'/picture" alt="" height="100" width="100">
                <span class="name">\'. $comment->comment_author .\'</span>
                <p>\'. $comment->comment_content .\'</p>
                <div class="date">\'. $comment->comment_date .\'</div>
                </li>\';
            endforeach;
        }
        $output .= \'</ul>\';

        if ( comments_open() ) :
            if($session){  
                try {  
                    $me = $fb->api(\'/me\');
                    $username = $me[\'username\'];
                    $firstname = $me[\'first_name\'];
                    $email = $me[\'email\'];

                    $output .= \'<form action="\'. get_site_url(). \'/wp-comments-post.php" method="post">
                        <img src="http://graph.facebook.com/\'. $username. \'/picture" alt="" height="50" width="50">
                        <div class="fieldslist">
                            <input id="author" name="author" type="hidden" value="\'. $firstname. \'">
                            <input id="fb_username" name="fb_username" type="hidden" value="\'. $username. \'">
                            <input id="email" name="email" type="hidden" value="\'. $email. \'">
                            <input id="fb_userid" name="fb_userid" type="hidden" value="\'. $session. \'">
                            <textarea name="comment" cols="45" rows="8" aria-required="true"></textarea>
                            <div class="submit">
                                <input type="checkbox" name="publish">
                                <label>Publish on your wall</label>
                                <input type="hidden" name="comment_post_ID" value="\'. get_the_ID(). \'" id="comment_post_ID">
                                <input type="submit" value="Comment">
                            </div>
                        </div>
                    </form>\';
                }  
                catch(FacebookApiException $e){  
                    error_log($e);  
                }
            }
        endif;
        return $output;
    }
}

<div class="coms">
    <?php echo do_shortcode(\'[fbconnect-wp-comments]\');  ?>
</div>