How to downgrade PHP

Using an example, I will downgrade PHP in Ubuntu 18.04, in which version 7.2 is installed by default. I do not recommend downgrading PHP, since newer versions are more productive and close vulnerabilities, but there are times when you need to run an old script or engine that does not work on newer versions of PHP, and it is very difficult to fix the code due to the fact that there are a lot of files.

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Nginx. Parameter default_server

The default_server parameter defines the default server to which a client request will be sent in which the host field is empty or an unknown domain is specified in it. For example, when a client opens the server IP address in a browser, or when the server has several domains, for example,,,, but not all domains are specified in the ngixn configuration.

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