PHP vs JS inheritance.php

*PHP*
================
class a {
	function f1() {echo "f1 from 'a'";}
}

class b extend a {
	function b1() {echo "b1 from 'b'";}
	function b2() {echo "b1 from 'b'";}
}

class c extend b {
	function c1() {echo "c1 from 'c'";}
	function c2() {echo "c1 from 'c'";}
}

class d extend c {
	function d1() {echo "d1 from 'd'";}
	function d2() {echo "d1 from 'd'";}
}

class e extend d {
	function f1() {echo "d1 from 'd'";}
	function call1() {$this->f1();}
	// enggak ada ada ekivalennya dg JAVASCRIPT ES5,
	// alias sama aja dg manggil: $this->f1()
	function call2() {echo '---'}
	function call3() {parent::f1();}
}

$v1 = new e;
$v1->call1();
$v1->call2();
$v1->call3();


*JAVASCRIPT ES5*
================

a = function(){};

a.prototype.f1 = function(){console.log("f1 from 'a'")}
a.prototype.f2 = function(){console.log("f2 from 'a'")}

// =====
b = function(){};

b.prototype = Object.create(a.prototype);
b.prototype.b1 = function(){console.log("b1 from 'b'")}
b.prototype.b2 = function(){console.log("b2 from 'b'")}

// =====
c = function(){};

c.prototype = Object.create(b.prototype);
c.prototype.c1 = function(){console.log("c1 from 'c'")}
c.prototype.c2 = function(){console.log("c2 from 'c'")}

// =====
d = function(){};

d.prototype = Object.create(c.prototype);
d.prototype.d1 = function(){console.log("d1 from 'd'")}
d.prototype.d2 = function(){console.log("d2 from 'd'")}

// =====
e = function(){};

e.prototype = Object.create(d.prototype);
e.prototype.f1 = function(){console.log("f1 from 'e'")}
e.prototype.call1 = function(){this.f1()}
e.prototype.call2 = function(){this.__proto__.f1()}
e.prototype.call3 = function(){this.__proto__.__proto__.f1()}

v1 = new e();
v1.call1();
v1.call2();
v1.call3();

*JAVASCRIPT ES6*
================

class a {
	f1(){console.log("f1 from 'a'")}
}

class b extends a {
	b1(){console.log("b1 from 'b'")}
	b2(){console.log("b2 from 'b'")}
}

class c extends b {
	c1(){console.log("c1 from 'b'")}
	c2(){console.log("c2 from 'b'")}
}

class d extends c {
	d1(){console.log("d1 from 'b'")}
	d2(){console.log("d2 from 'b'")}
}

class e extends d {
	f1(){console.log("f1 from 'e'")}
	call1(){this.f1()}
	// enggak ada ada ekivalennya dg JAVASCRIPT ES5,
	// alias sama aja dg manggil: this.f1()
	call2(){console.log("---")}
	call3(){super.f1()}
}

v1 = new e();
v1.call1();
v1.call2();
v1.call3();