Surround the creation of the tags with a try catch block

[alexandre-le-borgne]

Surround the creation of the tags of a try catch block to support php doc with unknown tags such as @jms\Type("int"), etc

[Johnmeurt]

This is useful to fix the support of unkonwn tags but it is not the solution. I was thinking about those 2 solutions:

• Raise custom exception as UnknownTagException. This could be catch on the DocBlockFactory (same way you did in your commit).
• Adding an options management in the context. Then adding "ignore_unkonwn_tags" option. This allows the dev to choose the behavior.

[jaapio]

I'm clossing this in favor of #110 which is an improved to support annotations in the future.