Symfony2 Use PHP Class Constant in YAML Config?
For Symfony >=2.4 you can use expression language
Example:
'@=constant("Symfony\\Bridge\\Monolog\\Logger::INFO")'
As of Symfony 3.2, it's also possible to use PHP constants in YAML files using a special !php/const: syntax:
parameters: bar: !php/const:PHP_INT_MAXSee the Symfony blog post for more details.
Please note: In Symfony 4 the syntax was slightly changed. You have to use a space instead of a double colon, for example:
parameters: bar: !php/const PHP_INT_MAXOtherwise, you will get a FileLoaderLoadException with the message "Notice: Uninitialized string offset".
In versions before Symfony 3.2, injecting PHP-constants only works with XML:
<parameter key="my_service.my_const" type="constant">My\Bundle\DependencyInjection\MyClass::MY_CONST</parameter>If you want to keep yor yml files, you could just import the xml-file into your services.yml. Mixing config styles might be a bit ugly, but as far as I know this is the only way to do it.
If this doesn't work for you, my comment to your question applies.