LTS 2.6.7 and PHP support
The current description of requirements for LTS 2.6.7 contains
" *PHP 5.3.3 or later with the following modules/libraries enabled"

That would include PHP versions like 7.0, 7.1 or 7.2.

LTS 2.6.7 under PHP 7.2?
When doing a quick installation the preinstallation check already fails under PHP 7.2.

Internal Server Error
Function name must be a string

An internal error occurred while the Web server was processing your request. Please contact the webmaster to report this problem.

Thank you.

PHP 7.1 looks the same.

When moving a complete installation to PHP 7.2. I see no issues.

So the installer might be a bit to edgy ;-) You can run LTS on PHP 7.2, but you cannot install it.