PHP RFC: Revisit trailing commas in function arguments

• Version: 0.1
• Date: 2015-10-07
• Author: Sammy Kaye Powers, me@sammyk.me
• Status: Withdrawn in favor of Trailing Commas In List Syntax RFC
• First Published at: https://wiki.php.net/rfc/trailing-comma-function-args

Arrays in PHP have long since supported trailing commas.

$foo = [
    'foo',
    'bar',
];

This makes for clean diffs and easy appending of new values in user-land.

Unfortunately, the argument list for function/method declarations and calls do not share the same luxury.

// Parse error
function myFunc(
    $foo,
    $bar,
    ) {
  /* ... */
}

// Parse error
myFunc(
    $foo,
    $bar,
    );

This RFC proposes allowing function/method declarations and calls to allow for trailing commas in order to:

1. Offer a consistent API and match the existing array functionality.
2. Make it easy to append new arguments in user-land.
3. Have cleaner diffs (so only one line shows up as being modified when appending arguments instead of two).
4. Match what HHVM did a while ago.

This change would have no breaking changes.

PHP 7.1

Project requires a 2/3 majority.

The original patch by Sara Golemon.