Online PHP editor | rfc for vJ36M

@ 2014-10-09T17:16:10Z

<?php

class Foo
{
    private $bar = 'baz';

    public function getBar()
    {
        return $this->bar;
    }
}

// http://3v4l.org/pc6lo#v540
class ClassicLazyFoo extends Foo
{
    private $initialized = false;

    public function getBar()
    {
        $this->init();

        return parent::getBar();
    }

    private function init()
    {
        if ($this->initialized) { return; }

        \Closure::bind(function() {
            var_dump('lazy loading!');

            $this->bar = 'Loaded from DB!';
        }, $this, get_parent_class($this))->__invoke();
    }
}

// look ma: no method overrides!
class LazyPropertyLazyFoo extends Foo
{
    public function __construct()
    {
        \Closure::bind(function() {
            unset($this->bar);
        }, $this, get_parent_class($this))->__invoke();
    }

    // note that other accessors also need to be created for full functional completeness
    public function __get($name)
    {
        \Closure::bind(function() {
            var_dump('lazy loading!');

            $this->bar = 'Loaded from DB!';
        }, $this, get_parent_class($this))->__invoke();

        return \Closure::bind(function() use ($name) {
            return $this->$name;
        }, $this, get_parent_class($this))->__invoke();
    }
}

var_dump('Trying classic lazy-loading via method overrides:');

$classic = new ClassicLazyFoo();

var_dump($classic->getBar());
var_dump($classic->getBar());
var_dump($classic->getBar());

var_dump('Trying lazy-loading via undefined properties:');

$lazyProperty = new LazyPropertyLazyFoo();

var_dump($lazyProperty->getBar());
var_dump($lazyProperty->getBar());
var_dump($lazyProperty->getBar());

Output for git.master, git.master_jit, rfc.property-hooks: string(49) "Trying classic lazy-loading via method overrides:" string(13) "lazy loading!" string(15) "Loaded from DB!" string(13) "lazy loading!" string(15) "Loaded from DB!" string(13) "lazy loading!" string(15) "Loaded from DB!" string(45) "Trying lazy-loading via undefined properties:" string(13) "lazy loading!" string(15) "Loaded from DB!" string(15) "Loaded from DB!" string(15) "Loaded from DB!"

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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2016-08-14 Arrow functions - withdrawn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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