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In frameworks like Zend Framework (or extensions of it), it is sometimes possible to pass information like type hints to the framework code by using PHPDoc style comments.

I cannot imagine that the framework parses the files using PHP, but I do not see any other way to achieve this, except for some built-in language feature of PHP, which I don't know of. So how is this done?

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They use reflection and especially ReflectionMethod::getDocComment() (there is also ReflectionClass::getDocComment(), ReflectionProperty::getDocComment() and ReflectionFunction::getDocComment()). The rest is simple: just parse the doc-block with some regular expressions or something like that.

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Cool. Thank you very much. Didn't know that the reflection class went that far. Any other cool features I missed out on?

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