Determines the maximum upload size allowed in php.ini.

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 * @since 5.6.0
 *
 * @param resource|GdImage|false $image A value to check the type for.
 * @return bool True if `$image` is either a GD image resource or a GdImage instance,
 *              false otherwise.
 */
function is_gd_image( $image ) {
	if ( $image instanceof GdImage
		|| is_resource( $image ) && 'gd' === get_resource_type( $image )
	) {
		return true;
	}

	return false;
}

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