Parameter support

[TiMESPLiNTER]

Proposal for #85

This is a first proposal to add parameter support. At the moment no recursive parameters are supported. This proposal is implemented to preserve backward compatibility.

Let's say we call the Config as follows:

$config = Config::load(
    ['some', 'config' ,'files'],
    ['parameters' => ['foo' => 'bar']]
);

we can use it in each of the config files like this:

config_key: "this is >%parameters.foo%<"

this will result in:

['config_key' => 'this is >bar<']

if you use a not existing parameter in a config value it will not be replaced and the configuration parsing will not fail:

config_key: "this is a %not.existing.parameter%"

will result in:

['config_key' => 'this is a %not.existing.parameter%']

Another idea would be to just merge the dynamic parameters into the config data and then allow using every config value as a parameter in another config value.

[gsouf]

That looks a good addition, @hassankhan would you like to merge it ?

[DavidePastore]

I'm really sorry for the delay. I would like to know how you can handle the case where you want to put in a property the string "%parameters.foo%", even if I have a property with the same key.

[peter279k]

How about let the optional $parameters be the empty array []?

[peter279k]

It has the same issue in the previous comment thread I mention.