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@ 2015-04-30T23:49:12Z

<?php
trait CastableBehavior {
    public static function getFromContext($obj) {
        foreach (get_object_vars($obj) as $key => $value) {
            $this->$key = $value;
        }
    }
}

interface UserTypes {
    const USER = 1;
    const ADMIN = 2;
    const MODERATOR = 3;
}

class User {
    private $id;
    private $name;    
    private $type;
    
    public function __construct($id, $name, $type) {
        $this->id = $id;
        $this->name = $name;
        $this->type = $type;
    }
    
    public function getID() {
        return $this->id;
    }

    public function getName() {
        return $this->name;
    }

    public function getType() {
        return $this->type;
    }
}

class Admin {
    use CastableBehavior;

    private $id;
    private $name;    
    private $type;
}

$user = new User(2, 'John', UserTypes::ADMIN);
if ($user->getType() === UserTypes::ADMIN) {
    $admin = Admin::getFromContext($foo);
}
var_dump($admin);

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Undefined variable $foo in /in/XXb4i on line 50 Fatal error: Uncaught TypeError: get_object_vars(): Argument #1 ($object) must be of type object, null given in /in/XXb4i:4 Stack trace: #0 /in/XXb4i(4): get_object_vars(NULL) #1 /in/XXb4i(50): Admin::getFromContext(NULL) #2 {main} thrown in /in/XXb4i on line 4
Process exited with code 255.

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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