Question

I’ve this error when I run the website,

ParameterNotFoundException: You have requested a non-existent parameter "ppr.database.host.dev".

I put the var in my terminal env, env returns me :

SYMFONY__PPR__DATABASE__HOST__DEV=localhost

I also put the var in my 2 php.ini files,
export

SetEnv SYMFONY__PPR__DATABASE__HOST__DEV localhost

And this var appears also in app/config/parameters.ini,

database_host = %ppr.database.host.dev%

Answer 1

for parameters.ini just simple add:

[parameters]
    ppr.database.host.dev = "localhost"
    database_host = %ppr.database.host.dev%

another way to have this parameter available for website: you should set evn in your host configuration.
for arapache it should be something like:

<VirtualHost *:80>
    ...
    SetEnv          SYMFONY__PPR__DATABASE__HOST__DEV localhost
    ...
</VirtualHost>