Support » Fixing WordPress » How to add Hidden Custom field to a Post in XML RPC

  • Good day!

    I am trying to insert hidden custom fields through XML RPC. The code works when the custom field is not hidden (without “_”), however, when I start placing an underscore (_) the value cannot be read.

    Can you help me on this?

    The code that I am using is:

    function wpPostXMLRPC($title,$body,$rpcurl,$username,$password,$category,$keywords='',$encoding='UTF-8') {
        $title = htmlentities($title,ENT_NOQUOTES,$encoding);
        $keywords = htmlentities($keywords,ENT_NOQUOTES,$encoding);
        $content = array(
            'mt_allow_comments'=>1,  // 1 to allow comments
            'mt_allow_pings'=>1,  // 1 to allow trackbacks
    		"custom_fields" => array(
    array( 'key' => 'try', 'value' => 'these are keywords' ),
    array( 'key' => '_test', 'value' => 'this is the title' )
        $params = array(0,$username,$password,$content,true);
        $request = xmlrpc_encode_request('metaWeblog.newPost',$params);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_POSTFIELDS, $request);
        curl_setopt($ch, CURLOPT_URL, $rpcurl);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, 1);
        $results = curl_exec($ch);
        return $results;
Viewing 5 replies - 1 through 5 (of 5 total)
  • bump! is there a bump here?

    I’m waiting for a solution as well…

    Did you get a solution for this? I have this issue this and I can’t find a solution

    You can find out more about the issue here

    You need to use the register_meta() method to register “protected” meta – fields starting with an _

    The following sample code can help get you started.

    class MyClass{
    function __construct(){
    add_action(‘init’, array($this,’_register_meta’));
    function _meta_sanitize_cb ( $meta_value, $meta_key, $meta_type ) {
    return $meta_value;
    function _meta_yes_you_can( $can, $key, $post_id, $user_id, $cap, $caps ) {
    return true;
    function _register_meta(){
    register_meta( ‘post’, ‘_my_field’, array($this,’_meta_sanitize_cb’), array($this,’_meta_yes_you_can’));

    [Moderator Note: Please post code or markup snippets between backticks or use the code button.]

    By the way that code block I posted should be in a plugin or somewhere on the WP side – it won’t work from your XMLRPC client

Viewing 5 replies - 1 through 5 (of 5 total)
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