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Metadata is a small utility library which allows us to search for metadata (attributes) in classes/properties/methods. Instead of using PHP's native reflection API and manual traversal, this library uses caching and is optimized for performance.
In general, this library is helpful in providing, in example, these questions:
- Does this class have specific attribute? Give me that attribute instance.
- Does this class have property/method with specific attribute? Give me that property/method and attribute instance.
- Give me all properties/methods with specific attribute.
- etc.
Using this library, it is trivial to implement various metadata-based features, such as serialization, validation,
mapping, etc. Doctrine behaviors, such as Timestampable, Blameable, etc. can be implemented using this library
as well, with less boilerplate code.