Actually, no. What I have now is comment blocks which may contain normal annotations and escaped ones. There's no need to go deeper in meta-meta-something.
Regarding the comment inside comment system, if it were possible to have nested comments, it wouldn't be a problem anymore :). Since it's a Symfony convention, one could simply count the number of stars at the beginning of a comment line to know the meta-comment depth level. BTW, I know that you are being sarcastic here.
Anyway, this is beside the original problem. Annotations in comments are a problem, granted, but somewhat limited. It's easier and faster for a parser to look for comments and then annotations in them, rather than parse the whole PHP grammar augmented with annotations. Especially in PHP.
Regarding the comment inside comment system, if it were possible to have nested comments, it wouldn't be a problem anymore :). Since it's a Symfony convention, one could simply count the number of stars at the beginning of a comment line to know the meta-comment depth level. BTW, I know that you are being sarcastic here.
Anyway, this is beside the original problem. Annotations in comments are a problem, granted, but somewhat limited. It's easier and faster for a parser to look for comments and then annotations in them, rather than parse the whole PHP grammar augmented with annotations. Especially in PHP.