Hi,
> how can I update the php version
Here:
http://wampserver.aviatechno.net/ there are more than one hundred and twenty versions of PHP, from 5.3.28 to 7.3.6, in the form of an "addon" for Wampserver.
You download the desired version and install it - as an administrator.
Then, you switch to this version via the Wampmanager menu:
Left-click -> PHP -> PHP -> Version -> Choose version
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons