I want to use the pingback.extensions.getPingbacks Method with parameters in the url, like post_type or page. I use the code below, but it doesn't work when I want to add a parameter and I get a fault code of 0 and an empty fault string, but it seems to work when I only pass the url without any parameters. Can anyone help me?


require_once 'class-IXR.php';
$rpc = new IXR_Client('http://localhost/wordpress/wordpress/xmlrpc.php');

$result = $rpc->query('pingback.extensions.getPingbacks','http://localhost/wordpress/wordpress/2018/01/17/hallo-welt/&post_type=something');

if(!$result) {
echo 'Error [' . $rpc->getErrorCode() . ']: ' . $rpc->getErrorMessage();




The error message

Error [0]: array(2) { ["faultCode"]=> int(0) ["faultString"]=> string(0) "" } 

Note that WordPress ships with WP_HTTP_IXR_CLIENT that extends the IXR_Client. So replace

require_once ABSPATH . WPINC . '/class-IXR.php';
$rpc = new IXR_Client( 'http://localhost/wordpress/wordpress/xmlrpc.php' );


require_once ABSPATH . WPINC . '/class-IXR.php';
require_once ABSPATH . WPINC . '/class-wp-http-ixr-client.php';
$rpc = new WP_HTTP_IXR_CLIENT( 'http://localhost/wordpress/wordpress/xmlrpc.php' );

Then try replacing:

$result = $rpc->query( 


$result = $rpc->query( 

The server method wp_xmlrpc_server::pingback_extensions_getPingbacks() uses the url_to_postid() function to convert the url to a post ID. So make sure your url works there!

PS: These days many WordPress users are looking into the new REST-API instead of the XML-RPC API.

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