The upstream repository hosting the PHP packages has currently an expired certificate.
New installations, updates, and restorations of applications relying on PHP will most probably fail with the following error: <package> has no installation candidate.
There is no workaround possible for this, you have to wait for the certificate to be renewed.
You can monitor the upstream issue but, please, no brigading over there: it’s January 1st, have a little patience. 
Aw thank you for the heads-up! I set up a brand new instance and decided to install some apps today (Monica, Matomo…) and they all failed. It’s the first time ever - since starting to use YunoHost a year ago and I couldn’t figure out why. Again, thank you for letting us know! I hope the certificate issue will be solved soon 
This is resolved.
It was a non automated certificate renewal from Ondřej Surý the owner of this project himself.
php packages of sury.org are really the work of one man.
Fact is as a user we can’t see this certificate since we access it through a varnish proxy that has another certificate which is valid. This issue might happen from time to time since it is maintained by a unique people.
That’s frightening 
This person has a lot of merit to deal with on his own.
And thank you 
so much for solving this problem.
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