ProductGroupAction::checkFloatValue

static function checkFloatValue($value): ?float
{
	if (is_array($value) || $value === null)
		return null;
	$value = (str_replace([',', ' '], ['.', ''], trim($value)));
	if ($value === '')
		return null;
	$value = (float)$value;
	return (is_finite($value) ? $value : null);
}