rest_handle_deprecated_argument( string $function_name, string $message, string $version )

function rest_handle_deprecated_argument( $function, $message, $version ) {
	if ( ! WP_DEBUG || headers_sent() ) {
		return;
	}
	if ( ! empty( $message ) ) {
		/* translators: 1: function name, 2: ClassicPress or WordPress version number, 3: error message */
		$string = sprintf( __( '%1$s (since %2$s; %3$s)' ), $function, $version, $message );
	} else {
		/* translators: 1: function name, 2: ClassicPress or WordPress version number */
		$string = sprintf( __( '%1$s (since %2$s; no alternative available)' ), $function, $version );
	}

	header( sprintf( 'X-WP-DeprecatedParam: %s', $string ) );
}