Hi folks. After much off-list discussion, iteration, and consideration, we have a new draft of PFA ready for review.
The URL is the same: https://wiki.php.net/rfc/partial_function_application It's a bit long because we wanted to be as precise as possible. However, in short: * Partial application creates a closure object you can use like any other. * A ? indicates "exactly one required parameter here" * A ... indicates "zero or more parameters here" * If the pattern in the partial is compatible with the underlying function, everything "just works" * If it's not compatible, you get an error. * Named placeholders are not supported. * Splat (argument unpacking) is not supported. That gives us the 3 most important use cases, plus many others: arbitrary_function(...) works to reference any function safely. (This is what Nikita's mini-scoped proposal did.) some_func(1, 2, ?, 5) works to reduce any function to single-argument, which makes it useful in many callback situations. any_func($all, $params, ...) works to provide all the arguments to a function but not call it yet; you can then cal the resulting closure later with no arguments to actually invoke it. We're reasonably confident that we have all the ins and outs covered, and in a performant way. Because it's such a heavy rework, though, we want to give it enough time for the discussion to settle, so won't call a vote for at least 2 weeks from today (give or take the feedback we get here). Cheers! -- Larry Garfield la...@garfieldtech.com -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: https://www.php.net/unsub.php
