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@ 2013-02-21T15:37:23Z

<?php

class Lock
{
    private $isLocked = false;

    public function unlock()
    {
        $this->isLocked = false;
        echo 'You unlocked the Lock'."\n";
    }
    public function lock()
    {
        $this->isLocked = true;
        echo 'You locked the Lock'."\n";
    }
    public function isLocked()
    {
        return $this->isLocked;
    }
}

class Door
{
    private $lock;
    private $connectsTo;

    public function __construct(Lock $lock)
    {
        $this->lock = $lock;
        $this->connectsTo = 'bedroom'."\n";
    }
    public function open()
    {
        if($this->lock->isLocked()) {
            echo 'Cannot open Door. It is locked.'."\n";
        } else {
            echo 'You opened the Door connecting to: ', $this->connectsTo."\n";
        }
    }
}

$lock = new Lock;

$door = new Door($lock);
$door->open();

$lock->unlock();
$door->open();

Output for git.master, git.master_jit, rfc.property-hooks: You opened the Door connecting to: bedroom You unlocked the Lock You opened the Door connecting to: bedroom

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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