wp_ajax_save_wporg_username() WordPress Function

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 ) );
}
Uses	Description
wp-includes/capabilities.php:current_user_can()	Returns whether the current user has the specified capability.
wp-includes/formatting.php:wp_unslash()	Removes slashes from a string or recursively removes slashes from strings within an array.
wp-includes/pluggable.php:check_ajax_referer()	Verifies the Ajax request to prevent processing requests external of the blog.
wp-includes/functions.php:wp_send_json_error()	Send a JSON response back to an Ajax request, indicating failure.
wp-includes/functions.php:wp_send_json_success()	Send a JSON response back to an Ajax request, indicating success.
wp-includes/user.php:update_user_meta()	Updates user meta field based on user ID.
wp-includes/user.php:get_current_user_id()	Gets the current user’s ID.