PHP RFC: Your Title Here

• Version: 0.1
• Date: 2016-11-21
• Author: Niklas Keller me@kelunik.com
• Status: Draft
• First Published at: http://wiki.php.net/rfc/parameter-no-type-variance

PHP doesn't currently allow variance for parameters as checking these for compatibility isn't possible on compile time. This limitation is caused by autoloading and doesn't allow widening the accepted parameters.

This RFC proposes to allow ommiting the type entirely in a subclass, as dropping all parameter constraints is always valid according to the LSP principle.

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Next minor version, currently 7.2.

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In the future there might be support for contra-variance / co-variance for parameters / return types.

Requires a 2/3 majority.

TBD.

TBD.

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