Insert the postmeta values needed for an ACF repeater field

gistfile1.txt

add_filter('add_post_metadata', 'create_acf_repeater', 10);
function create_acf_repeater($check, $object_id, $meta_key, $meta_value)
{
	if (strpos($meta_key, 'acf_repeater_') === 0)
	{
		$key_base = str_replace('acf_repeater_', '', $meta_key);
		$meta_values = explode("\n", $meta_value);
		add_post_meta($object_id, substr($key_base, 0, strpos($key_base, '_x_')), count($meta_values));
		foreach ($meta_values as $i => $value)
		{
			add_post_meta($object_id, str_replace('_x_', '_'.$i.'_', $key_base), $value);
		}
		return false;
	}
	return $check;
}