我有一个IFTTT recipe 这会在某些情况下为我创建帖子，但出于某种奇怪的原因，它会创建三个，有时是四个内容相同的帖子。

我想添加一个add_action 钩住/回调以验证新帖子的内容，如果已经存在，则取消该帖子，或将其移动到垃圾桶或类似的地方。

我找到了xmlrpc_prepare_post 但我想我不能从那里取消它。除非我可以更新某些属性并将其设置为垃圾？

Update.

我尝试了以下操作，它只会进入xmlrpc\\u调用，而不会进入xmlrpc\\u wp\\u insert\\u post\\u meta。我甚至添加了一个硬编码的add\\u filter调用（不仅仅是在if newPost的情况下），我的日志从来没有显示这样的日志消息。

代码如下：

function hueman_xmlrpc_call( $method )
{
    error_log("XMLRPC | hueman_xmlrpc_call Method = $method \\n" , 3, \'/home/.../debug.log\');
    if( \'wp.newPost\' === $method || \'metaWeblog.newPost\' === $method )
    {
        error_log("XMLRPC | hueman_xmlrpc_call  method = " . $method . " \\n" , 3, \'/home/.../debug.log\');
        add_filter( \'xmlrpc_wp_insert_post_data\', \'hueman_xmlrpc_wp_insert_post_data\' );
    }
}
add_action(\'xmlrpc_call\', \'hueman_xmlrpc_call\', 1 );


add_filter( \'xmlrpc_wp_insert_post_data\', \'hueman_xmlrpc_wp_insert_post_data\' );

function hueman_xmlrpc_wp_insert_post_data( $post_data )
{
    error_log("XMLRPC | hueman_xmlrpc_wp_insert_post_data  \\n" , 3, \'/home/.../debug.log\');
    // Check if the post title exists:
    $tmp = get_page_by_title( 
        $post_data[\'post_title\'], 
        OBJECT, 
        $post_data[\'post_type\'] 
    );

    if( is_object ( $tmp ) )
    {
        // Go from \'insert\' to \'update\' mode within wp_insert_post():
        //$post_data[\'ID\'] = $tmp->ID; 

        $post_data[\'post_status\'] = \'trash\';
        error_log("XMLRPC | hueman_xmlrpc_wp_insert_post_data I TRASHED IT! \\n" , 3, \'/home/.../debug.log\');
    }

    return $post_data;  
}

在日志中，我有这样的日志语句：

XMLRPC | hueman_xmlrpc_call Method = mt.supportedMethods 
XMLRPC | hueman_xmlrpc_call Method = metaWeblog.getRecentPosts 
XMLRPC | hueman_xmlrpc_call Method = mt.supportedMethods 
XMLRPC | hueman_xmlrpc_call Method = metaWeblog.getRecentPosts 
XMLRPC | hueman_xmlrpc_call Method = mt.supportedMethods 
XMLRPC | hueman_xmlrpc_call Method = metaWeblog.getRecentPosts 
XMLRPC | hueman_xmlrpc_call Method = metaWeblog.getCategories 
XMLRPC | hueman_xmlrpc_call Method = metaWeblog.newPost 
XMLRPC | hueman_xmlrpc_call  method = metaWeblog.newPost 

然后，我看到了在创建文章时添加的其他过滤器。我知道我最终可能会修复那里的文章，但我相信这个XMLRPC过滤器/操作应该可以工作。

从日志中，我看到它进入if newPost并添加过滤器“xmlrpc\\u wp\\u insert\\u post\\u data”，但它从不执行hueman\\u xmlrpc\\u wp\\u insert\\u post\\u data函数…：(

do_action( \'xmlrpc_call\', \'wp.newPost\' );

do_action( \'xmlrpc_call\', \'wp.newPost\', ..., $content_struct );

/**
 * Prevent duplicate posts when doing wp.newPost via XML-RPC
 *
 * @see http://wordpress.stackexchange.com/a/157261/26350
 */

add_action( \'xmlrpc_call\', \'wpse_xmlrpc_call\' );

function wpse_xmlrpc_call( $method )
{
    if( \'wp.newPost\' === $method )
        add_filter( \'xmlrpc_wp_insert_post_data\', \'wpse_xmlrpc_wp_insert_post_data\' );
}

function wpse_xmlrpc_wp_insert_post_data( $post_data )
{
    // Check if the post title exists:
    $tmp = get_page_by_title( 
        $post_data[\'post_title\'], 
        OBJECT, 
        $post_data[\'post_type\'] 
    );

    // Go from \'insert\' to \'update\' mode within wp_insert_post():
    if( is_object ( $tmp ) )
        $post_data[\'ID\'] = $tmp->ID; 

    return $post_data;  
}

    $post_data[\'post_status\'] = \'trash\'; 

$post_title = isset( $content_struct[\'title\'] ) ? $content_struct[\'title\'] : null;
$post_content = isset( $content_struct[\'description\'] ) ? $content_struct[\'description\'] : null;

global $wpdb;
$some_post = $wpdb->get_row("
    SELECT ID
    FROM {$wpdb->posts}
    WHERE post_title = \'{$post_title}\'
");

if (!empty($some_post->ID) and $some_post->ID > 0) {
    return 0;
} else {
    // the rest of the code that already exists in the function
    /*
    $post_status = $publish ? \'publish\' : \'draft\';
    ...
    return strval($post_ID);
    */
}

/** Include the bootstrap for setting up WordPress environment */
require_once __DIR__ . \'/wp-load.php\';

$mixml = file_get_contents(\'php://input\');
$mixml2 = simplexml_load_string($mixml);
$json = json_encode($mixml2);

if ( ! is_admin() ) {
    require_once( ABSPATH . \'wp-admin/includes/post.php\' );
}

$jsonIterator = new RecursiveIteratorIterator(
    new RecursiveArrayIterator(json_decode($json, TRUE)),
    RecursiveIteratorIterator::SELF_FIRST);

$nextok=false;
//Sorry for the noob parsing :)
foreach ($jsonIterator as $key => $val) {   
    if ($val=="title") $nextok=true;    
    if (($key=="string")&&($nextok)) { 
        $nextok=false;      
        $post_id = post_exists($val);
        //already exists, so I break the posting with exit
        if ($post_id) exit;                             
    }                   
}