WordPress at a glance
function is not described

weblog_ping() WP 1.2.0

Send a pingback.

No Hooks.

Return

Nothing (null).

Usage

weblog_ping( $server, $path );
$server(string)
Host of blog to connect to.
Default: ''
$path(string)
Path to send the ping.
Default: ''

Code of weblog ping: wp-includes/comment.php VER 5.0.3

<?php
function weblog_ping($server = '', $path = '') {
	include_once( ABSPATH . WPINC . '/class-IXR.php' );
	include_once( ABSPATH . WPINC . '/class-wp-http-ixr-client.php' );

	// using a timeout of 3 seconds should be enough to cover slow servers
	$client = new WP_HTTP_IXR_Client($server, ((!strlen(trim($path)) || ('/' == $path)) ? false : $path));
	$client->timeout = 3;
	$client->useragent .= ' -- WordPress/' . get_bloginfo( 'version' );

	// when set to true, this outputs debug messages by itself
	$client->debug = false;
	$home = trailingslashit( home_url() );
	if ( !$client->query('weblogUpdates.extendedPing', get_option('blogname'), $home, get_bloginfo('rss2_url') ) ) // then try a normal ping
		$client->query('weblogUpdates.ping', get_option('blogname'), $home);
}