…guiluz)

This PR was merged into the master branch.

Discussion
----------

Document the built in env var processors

This is start at adding documentation for env var processors, e.g. `%env(int:FOO)%`

I would welcome some feedback, if this a appropriate way to go about this, I think it needs some more examples to show how its used.

It also would ideally add a description of how custom processors are added, although that might be a later request.

starts to fix #8382, #9094

Commits
-------

aed1607 Minor rewords and formatting fixes
e3fe5fe Example of customer env var processor
67227a6 Add examples for parameter processors
cd353c7 Add description of the built in envvar processors

…javiereguiluz)

This PR was merged into the 3.4 branch.

Discussion
----------

Document the built in env var processors

This is start at adding documentation for env var processors, e.g. `%env(int:FOO)%`

I would welcome some feedback, if this a appropriate way to go about this, I think it needs some more examples to show how its used.

It also would ideally add a description of how custom processors are added, although that might be a later request.

starts to fix symfony#8382, symfony#9094

Commits
-------

aed1607 Minor rewords and formatting fixes
e3fe5fe Example of customer env var processor
67227a6 Add examples for parameter processors
cd353c7 Add description of the built in envvar processors