trailing-list.php

<?php

use Foo\Bar\{ Foo, Bar, Baz, }; // group use

$array = [1, 2, 3,]; // array

fooCall($arg1, $arg2, $arg3,);  // function call arglist

class Foo { // class member lists
    const
        A = 1010,
        B = 1021,
        C = 1032,
        D = 1043,
    ;

    protected
        $a = 'foo',
        $b = 'bar',
        $c = 'baz',
    ;
    
    private
        $blah,
    ;
    
    // arglist declarations
    function something(FooBarBazInterface $in, FooBarBazInterface $out,) : bool
    {
    }
}

// traits

class MyClass
{
    use
        FooTrait,
        BarTrait,
        BazTrait,
    ;
}

// implements

implements class Foo implements
    FooInterface,
    BarInterface,
    BazInterface,
{
}

Probably should add implements lists:

class Foo implements
    FooInterface,
    BarInterface,
    BazInterface,
{
}

Oh! Also traits:

class MyClass
{
    use FooTrait,
           BarTrait,
           BazTrait,
    ;
}