Hi,
PHP versions installed by Wampserver 3.1.9 64bit are :
- 5.6.40 (Default CLI version),
- 7.0.33,
- 7.1.29,
- 7.2.18 (Default WEB version)
- 7.3.5
> The latest visible version is 7.3.1
Not installed by Wampserver 3.1.9 full installer.
> But in the phpinfo page, it is the active version.
Since PHP version 7.3.1 is not installed by Wampserver 3.1.9, this means that you have older versions of PHP or an older version of a PHP server that have not been cleaned before installing Wampserver.
You may also have paths to a PHP version in the environment variables.
On the other hand, did you respect the prerequisites displayed just before the installation actually started?
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons