changelog/10.4.0_2020-02-10/36290-1
Change: Drop PHP 7.0 support across the platform
Support for security fixes for PHP 7.0 ended 1 Jan 2019
ownCloud core no longer supports PHP 7.0.
Ensure that you are using PHP 7.1 or later.
https://github.com/owncloud/core/pull/36290
https://www.php.net/supported-versions.php