A regression compared to which version ?

Note that the right syntax is !php/const PDO::MYSQL_ATTR_INIT_COMMAND, not !php/const:PDO::MYSQL_ATTR_INIT_COMMAND

it works indeed with !php/const PDO::MYSQL_ATTR_INIT_COMMAND

somehow !php/const:PDO::MYSQL_ATTR_INIT_COMMAND has been working at least since 5.1 until 6.1, but if that is not intended to work like that, I guess we can close this ticket

https://symfony.com/blog/new-in-symfony-3-2-php-constants-in-yaml-files eg uses both !php/const: and !php/const in the same article

uses both !php/const: and !php/const in the same article

Yes, with a comment explaining that on Symfony 3.4 onwards, you should use the notation without :.

Thanks, my bad

However it is strange that support for !php/const: (deprecated in 3.x I suppose) is dropped in Symfony 6.2, I would rather expect that in Symfony 4.0 or any future major version

However it is strange that support for !php/const: (deprecated in 3.x I suppose) is dropped in Symfony 6.2, I would rather expect that in Symfony 4.0 or any future major version

Yeah, me too. If this notation has really still worked in 6.1 and possibly 5.x as well, we should consider treating this issue as a regression.

@guillaumesmo Can you create a small example application using 6.1 where this works?

git clone [email protected]:guillaumesmo/symfony-issue-48135.git
cd symfony-issue-48135
symfony serve
curl http://127.0.0.1:8000

In this example I used the prefix in a simple parameter, and it also fails there, so the issue is not limited to doctrine config.

parameters:
    test_params:
        !php/const:PHP_INT_SIZE: test

With Symfony 6.0/6.1 I get the following: {"8":"test"}

With Symfony 6.2-BETA2 I get this error: Fatal error: Uncaught Symfony\Component\Yaml\Exception\ParseException: Mapping values are not allowed in multi-line blocks at line 16 (near "!php/const:PHP_INT_SIZE: test").

It should be possible to improve the exception message, to suggest the correct syntax.

@GromNaN it is deprecated since 3.x ... but now it's a bc break. Shouldn't we now support the : until version 7.0?