在PHP站点的页面上添加Facebook评论插件的实例教程

首先，需要在facebook创建一个APP，创建方法见https://developers.facebook.com/，APP有一项是填写Domain的，这里填写你website的Domain。（APP是绑定domain的，不能乱填）
然后就可以使用facebook comments plugins。

使用facebook comments plugins，可以在页面中插入facebook comments。
生成code方法：https://developers.facebook.com/docs/plugins/comments

例如：有一个页面是http://www.example.com/ ，在这个页面中插入以下代码便可以使用comments plugings。

<!-- include facebook js sdk -->
<script id="facebook-jssdk" src="https://connect.facebook.net/en_GB/all.js#xfbml=1&appId=这里填写APPID"></script> 

<!-- comments plugins -->
<fb:comments colorscheme="light" numposts="4" height="360px;" width="614px" href="http://www.example.com/" fb-xfbml-state="rendered" class="fb_iframe_widget"></fb:comments>

在页面上显示如下

读取页面的分享总数与评论总数

https://graph.facebook.com/?ids={YOUR_URL}

{YOUR_URL} 需要 urlencode
例如：https://graph.facebook.com/?ids=http%3A%2F%2Fwww.example.com%2F
返回：

{
  "http://www.example.com/": {
   "id": "http://www.example.com/",
   "shares": 399517,
   "comments": 392
  }
}

代码如下：

<?php
$url = 'http://www.example.com/';
$api = 'https://graph.facebook.com/?ids='; 

$result = json_decode(file_get_contents($api.urlencode($url)), true); 

print_r($result);
?>

读取页面评论列表

https://graph.facebook.com/comments/?ids={YOUR_URL}

{YOUR_URL} 需要 urlencode
例如：https://graph.facebook.com/comments/?ids=http%3A%2F%2Fwww.example.com%2F
返回：

{
  "http://www.example.com/": {
   "comments": {
     "data": [
      {
        "id": "395320319544_27462154",
        "from": {
         "id": "100000223906701",
         "name": "Thu\u1eadn Phan Thanh"
        },
        "message": "hello moto",
        "can_remove": false,
        "created_time": "2013-10-07T10:01:40+0000",
        "like_count": 1,
        "user_likes": false
      },
      {
        "id": "395320319544_27877980",
        "from": {
         "id": "100001638736612",
         "name": "L\u00e3 Minh"
        },
        "message": "hi you",
        "can_remove": false,
        "created_time": "2013-11-13T02:57:01+0000",
        "like_count": 4,
        "user_likes": false
      },
      {
        "id": "395320319544_27879381",
        "from": {
         "id": "100004229015145",
         "name": "Th\u00f9y Dung"
        },
        "message": "Mg \u1ee7ng h\u1ed9 t\u1edb v\u1edbi nh\u1edb \u003C3",
        "can_remove": false,
        "created_time": "2013-11-13T05:38:12+0000",
        "like_count": 3,
        "user_likes": false
      }
      ...
     ],
     "paging": {
      "cursors": {
        "after": "MjU0",
        "before": "Mzk4"
      },
      "next": "https://graph.facebook.com/v1.0/395320319544/comments?limit=25&after=MjU0"
     }
   }
  }
}

根据next的url再请求可以获取下一页的评论内容

代码如下：

<?php
$url = 'http://www.example.com/';
$api = 'https://graph.facebook.com/comments/?ids='; 

$result = json_decode(file_get_contents($api.urlencode($url)), true); 

print_r($result);
?>