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@ 2017-07-05T13:02:52Z

<?php
interface intf{
    public function setVar($a);
    public function getVar();
}

class A implements intf{
    private $A;
    public function setVar($a){
        $this->A=$a;
    }
    public function getVar(){
        return $this->A;
    }
}

class B extends Abs{
    private $B;
    
    public function setVar($a){
        $this->B=$a;
    }
    
    public function getVar(){
        return $this->B;
    }
}

abstract class Abs{
    abstract public function setVar($a);
    abstract public function getVar();
    public function getDouble($a){
        return $a*2;
    }
}
$A=new A();
$B=new B();
$A->setVar(2);
echo ' Class A: '.$A->getVar();
$B->setVar(4);

echo ' Class B: '.$B->getVar();

echo ' Class B Double: '.$B->getDouble($B->getVar());

echo ' Class A Double: '.$B->getDouble($A->getVar());

Output for git.master, git.master_jit, rfc.property-hooks: Class A: 2 Class B: 4 Class B Double: 8 Class A Double: 4

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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