WordPress at a glance
function is not described

WP_Ajax_Response::send() public WP 2.1.0

Display XML formatted responses.

Sets the content type header to text/xml.

{} It's a method of the class: WP_Ajax_Response{}

No Hooks.

Return

Null. Nothing.

Usage

$WP_Ajax_Response = new WP_Ajax_Response();
$WP_Ajax_Response->send();

Changelog

Since 2.1.0 Introduced.

Code of WP_Ajax_Response::send() WP 5.5.1

<?php
public function send() {
	header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ) );
	echo "<?xml version='1.0' encoding='" . get_option( 'blog_charset' ) . "' standalone='yes'?><wp_ajax>";
	foreach ( (array) $this->responses as $response ) {
		echo $response;
	}
	echo '</wp_ajax>';
	if ( wp_doing_ajax() ) {
		wp_die();
	} else {
		die();
	}
}