UserFieldManager::parseUserFieldFieldsFromString

static function parseUserFieldFieldsFromString(string $combinedFields): ?array
{
	/** @var string[] $data */
	$data = explode('|', $combinedFields);
	if (count($data) === 2)
	{
		return [
			'entityId' => $data[0],
			'fieldName' => $data[1],
		];
	}

	return null;
}