I had a case where I wanted to store a configuration into a vhost environment variable. But how to get this into your symfony parameters? There is a special environment variable prefix in Symfony which will automatically be converted into a parameters variable. It is
The prefix will be stripped, the variable name will be converted to lowercase and a double underscore
__ will be converted to a dot
. as this is an invalid character in an environment variable.
So the following environment variable
will become the following parameter variable