PHP远程操纵WordPress的方法(流程剖析）

一直想写一个给wordpress群发文章的应用，这样我就能自动采集文章，然后写个脚本自动发送文章了，哈哈。虽然用python干这种事情貌似更加擅长，但是我想做个web界面访问该应用，而python的虚拟主机现在还好少（至少PHP真的很容易有），于是拿起老本行，用PHP来搞定。

学PHP也已经有很长时间，从原来的纯手工编写，到后来的网上找类库自己整合，再到如今的直接使用框架。我再也不愿意从头开始写程序，现成的框架有大量的优秀代码，拿来用能实现目标何乐而不为，之前也用过zend、thinkphp、codeigniter，前两者其实都不错，但是现在我还是很偏爱codeigniter，就因为它强大的在线文档。

我使用的是CI(codeigniter)的“XML-RPC 和 XML-RPC 服务器类”，以下代码实现了将服务器wordpress站点的标签信息获取下来打印：

public function index(){//加载CI的xmlrpc类库$this->load->library('xmlrpc');//设定远程的XMLRPC.php文件的地址$this->xmlrpc->server('http://jobrule.sinaapp.com/xmlrpc.php');/* * 设定需要操作的方法，该字符串，可以在wordpress服务器上 * 的/wp-includes/class-wp-xmlrpc-server.php里面找到 */$this->xmlrpc->method('wp.getTags');/* * 设定请求参数，可以直接去看class-wp-xmlrpc-server.php的源代码， * 其中第0个是id，第一个和第二个是用户名密码 */$request = array('','admin', '123456789');//将参数设定到请求里面，这时候还没有发送请求$this->xmlrpc->request($request);//发送请求if ( ! $this->xmlrpc->send_request()){echo $this->xmlrpc->display_error();}//打印结果看一看echo "<pre>";print_r( $this->xmlrpc->display_response());echo "</pre>";//$this->load->view('welcome_message');}

CI的官方文档列出了xmlrpc类的API：

• $this->xmlrpc->server()：设定发送请求的服务器URL和端口号
• $this->xmlrpc->timeout()：设定一个发送请求的响应时间
• $this->xmlrpc->method()：设定请求的服务方法字符串（重要）
• $this->xmlrpc->request()：绑定发送请求的数据参数，并不发送请求
• $this->xmlrpc->send_request()：发送请求
• $this->xmlrpc->display_error()：打印错误信息
• $this->xmlrpc->display_response()：打印返回的响应信息
• $this->xmlrpc->set_debug(TRUE)：开发过程中打印一些调试信息

关键在于$this->xmlrpc->method()，该接口设定向服务器发送什么样的请求。下载一个wordpress源码，打开\wp-includes\class-wp-xmlrpc-server.php文件，可以看到所有的我们能够调用的服务：

// WordPress API'wp.getUsersBlogs'=> 'this:wp_getUsersBlogs','wp.newPost'=> 'this:wp_newPost','wp.editPost'=> 'this:wp_editPost','wp.deletePost'=> 'this:wp_deletePost','wp.getPost'=> 'this:wp_getPost','wp.getPosts'=> 'this:wp_getPosts','wp.newTerm'=> 'this:wp_newTerm','wp.editTerm'=> 'this:wp_editTerm','wp.deleteTerm'=> 'this:wp_deleteTerm','wp.getTerm'=> 'this:wp_getTerm','wp.getTerms'=> 'this:wp_getTerms','wp.getTaxonomy'=> 'this:wp_getTaxonomy','wp.getTaxonomies'=> 'this:wp_getTaxonomies','wp.getPage'=> 'this:wp_getPage','wp.getPages'=> 'this:wp_getPages','wp.newPage'=> 'this:wp_newPage','wp.deletePage'=> 'this:wp_deletePage','wp.editPage'=> 'this:wp_editPage','wp.getPageList'=> 'this:wp_getPageList','wp.getAuthors'=> 'this:wp_getAuthors','wp.getCategories'=> 'this:mw_getCategories',// Alias'wp.getTags'=> 'this:wp_getTags','wp.newCategory'=> 'this:wp_newCategory','wp.deleteCategory'=> 'this:wp_deleteCategory','wp.suggestCategories'=> 'this:wp_suggestCategories','wp.uploadFile'=> 'this:mw_newMediaObject',// Alias'wp.getCommentCount'=> 'this:wp_getCommentCount','wp.getPostStatusList'=> 'this:wp_getPostStatusList','wp.getPageStatusList'=> 'this:wp_getPageStatusList','wp.getPageTemplates'=> 'this:wp_getPageTemplates','wp.getOptions'=> 'this:wp_getOptions','wp.setOptions'=> 'this:wp_setOptions','wp.getComment'=> 'this:wp_getComment','wp.getComments'=> 'this:wp_getComments','wp.deleteComment'=> 'this:wp_deleteComment','wp.editComment'=> 'this:wp_editComment','wp.newComment'=> 'this:wp_newComment','wp.getCommentStatusList' => 'this:wp_getCommentStatusList','wp.getMediaItem'=> 'this:wp_getMediaItem','wp.getMediaLibrary'=> 'this:wp_getMediaLibrary','wp.getPostFormats'     => 'this:wp_getPostFormats','wp.getPostType'=> 'this:wp_getPostType','wp.getPostTypes'=> 'this:wp_getPostTypes',// Blogger API'blogger.getUsersBlogs' => 'this:blogger_getUsersBlogs','blogger.getUserInfo' => 'this:blogger_getUserInfo','blogger.getPost' => 'this:blogger_getPost','blogger.getRecentPosts' => 'this:blogger_getRecentPosts','blogger.getTemplate' => 'this:blogger_getTemplate','blogger.setTemplate' => 'this:blogger_setTemplate','blogger.newPost' => 'this:blogger_newPost','blogger.editPost' => 'this:blogger_editPost','blogger.deletePost' => 'this:blogger_deletePost',// MetaWeblog API (with MT extensions to structs)'metaWeblog.newPost' => 'this:mw_newPost','metaWeblog.editPost' => 'this:mw_editPost','metaWeblog.getPost' => 'this:mw_getPost','metaWeblog.getRecentPosts' => 'this:mw_getRecentPosts','metaWeblog.getCategories' => 'this:mw_getCategories','metaWeblog.newMediaObject' => 'this:mw_newMediaObject',// MetaWeblog API aliases for Blogger API// see http://www.xmlrpc.com/stories/storyReader$2460'metaWeblog.deletePost' => 'this:blogger_deletePost','metaWeblog.getTemplate' => 'this:blogger_getTemplate','metaWeblog.setTemplate' => 'this:blogger_setTemplate','metaWeblog.getUsersBlogs' => 'this:blogger_getUsersBlogs',// MovableType API'mt.getCategoryList' => 'this:mt_getCategoryList','mt.getRecentPostTitles' => 'this:mt_getRecentPostTitles','mt.getPostCategories' => 'this:mt_getPostCategories','mt.setPostCategories' => 'this:mt_setPostCategories','mt.supportedMethods' => 'this:mt_supportedMethods','mt.supportedTextFilters' => 'this:mt_supportedTextFilters','mt.getTrackbackPings' => 'this:mt_getTrackbackPings','mt.publishPost' => 'this:mt_publishPost',// PingBack'pingback.ping' => 'this:pingback_ping','pingback.extensions.getPingbacks' => 'this:pingback_extensions_getPingbacks','demo.sayHello' => 'this:sayHello','demo.addTwoNumbers' => 'this:addTwoNumbers'

根据方法名字，很容易知道是什么意思。要知道某一个方法需要发送什么参数，直接找到该方法，方法的注释可以看出需要什么参数，比如发送文章的newpost方法，根据注释知道需要如下参数：

/** * Create a new post for any registered post type. * * @since 3.4.0 * * @param array $args Method parameters. Contains: *  - int     $blog_id *  - string  $username *  - string  $password *  - array   $content_struct *      $content_struct can contain: *      - post_type (default: 'post') *      - post_status (default: 'draft') *      - post_title *      - post_author *      - post_exerpt *      - post_content *      - post_date_gmt | post_date *      - post_format *      - post_password *      - comment_status - can be 'open' | 'closed' *      - ping_status - can be 'open' | 'closed' *      - sticky *      - post_thumbnail - ID of a media item to use as the post thumbnail/featured image *      - custom_fields - array, with each element containing 'key' and 'value' *      - terms - array, with taxonomy names as keys and arrays of term IDs as values *      - terms_names - array, with taxonomy names as keys and arrays of term names as values *      - enclosure *      - any other fields supported by wp_insert_post() * @return string post_id */

至此PHP远程操作wordpress的基本流程已经非常清晰，本文使用的是CI的xmlrpc类，网友可以自己网上随便找个开源类代替，他们的接口肯定大同小异。关键是弄懂了服务端提供了什么服务，直接调用就好了。