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@ 2016-03-15T09:44:52Z

<?php

abstract class Visitor
{
    public final function __call(string $method, array $args)
    {
        if ($method === 'visit') {
            $class = substr(strrchr(static::class, '\\'), 1);
            $method .= $class;
            die(static::class);
            if (method_exists($this, $method)) {
                return call_user_func_array([$this, $method], $args);
            }
        }
        
        throw new Exception('Unknown method ' . $method);
    }
}

interface Visitable
{
    public function accept(Visitor $v);
}

class FooVisitor extends Visitor
{
    public function visitFoo(Foo $foo)
    {
        print 'visit Foo' . PHP_EOL;
    }
}

class Foo implements Visitable
{
    public function accept(Visitor $v)
    {
        $v->visit($this);
    }
}

$fv = new FooVisitor();
$f = new Foo();
$f->accept($fv);

Output for git.master, git.master_jit, rfc.property-hooks: FooVisitor

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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