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@ 2020-11-07T03:06:57Z

<?php

interface Kubus {
    public function set_sisi($s);
    public function luas_kubus();
    public function volume_kubus();
}

interface Balok {
    public function luas_balok($p, $l);
    public function volume_balok($t);
}

class Hitung implements Kubus, Balok{
    public $sisi;
    public function set_sisi($s) {
        $this->sisi = $s;
        return $this;
    }
    public function luas_kubus() {
        echo "Luas Kubus = " . $this->sisi * 2;
        return $this;
    }
    
    public function volume_kubus() {
        echo "Volume Kubus = " . $this->sisi * 3;
        return $this;
    }
    public function luas_balok($p, $l) {
        return;
    }
    public function volume_balok($t) {
        return;
    }
}

$hitung = new Hitung;
echo $hitung->set_sisi(4)->luas_kubus()->volume_kubus();

Output for git.master, git.master_jit, rfc.property-hooks: Luas Kubus = 8Volume Kubus = 12 Fatal error: Uncaught Error: Object of class Hitung could not be converted to string in /in/L1Qbb:38 Stack trace: #0 {main} thrown in /in/L1Qbb on line 38
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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