What about using double-quotes arround your values, and using real newlines, like this :
message = "Hi {0},
This is a test message.
Goodbye!"
As an example, using this portion of code :
$config = new Zend_Config_Ini(APPLICATION_PATH . '/config/application.ini');
var_dump($config->production->testmessage);
die;
With application.ini
containing this :
[production]
testmessage = "this is
a new
message"
I get the following output from my var_dump
:
string(21) "this is
a new
message"
Pascal MARTIN
2010-03-19 19:45:44