WordPress at a glance
function is not described

wp_ajax_save_wporg_username() WP 4.4.0

Ajax handler for saving the user's WordPress.org username.

No Hooks.

Return

Nothing (null).

Usage

wp_ajax_save_wporg_username();

Code of wp ajax save wporg username: wp-admin/includes/ajax-actions.php VER 5.1.1

<?php
function wp_ajax_save_wporg_username() {
	if ( ! current_user_can( 'install_themes' ) && ! current_user_can( 'install_plugins' ) ) {
		wp_send_json_error();
	}

	check_ajax_referer( 'save_wporg_username_' . get_current_user_id() );

	$username = isset( $_REQUEST['username'] ) ? wp_unslash( $_REQUEST['username'] ) : false;

	if ( ! $username ) {
		wp_send_json_error();
	}

	wp_send_json_success( update_user_meta( get_current_user_id(), 'wporg_favorites', $username ) );
}