March 26, 2019 Javier Eguiluz

When using env vars to configure Symfony it's common to use URLs to define the value of DSN-like config options like the following:

However, sometimes you need to access to some parts of the URL (such as the database name or the port number) to define the value of other options. In Symfony 4.3, we've added two new env var processors ( url and query_string ) to do that.

The url processor parses the given URL and returns an associative array with its components, so you can combine it with the key processor:

YAML 1 2 3 4 5 6 7 8 9 10 # config/packages/mongodb.yaml mongo_db_bundle : clients : default : # ... username : '%env(key:user:url:MONGODB_URL)%' password : '%env(key:pass:url:MONGODB_URL)%' connections : default : database_name : '%env(key:path:url:MONGODB_URL)%'

XML 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 <!-- config/packages/mongodb.xml --> <?xml version="1.0" encoding="UTF-8" ?> <container xmlns= "http://symfony.com/schema/dic/services" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd" > <mongodb:config> <mongodb:client name= "default" username= "%env(key:user:url:MONGODB_URL)%" password= "%env(key:pass:url:MONGODB_URL)%" > <!-- ... --> </mongodb:client> <mongodb:connections name= "default" database_name= "%env(key:path:url:MONGODB_URL)%" /> </mongodb:config> </container>

The query_string processor parses the query string part of the given URL and returns an associative array with its components, so you can also combine it with the key processor. If the env var is defined like this:

You can get the value of the timeout parameter of the query string as follows: