Kovalsky

class Person {
  constructor(name) {
    this.name = name;
  }
  sayName() {
    console.log('My name is ', this.name + '!');
  }
  sayHi() {
    console.log('Hello everybody!');
  }
}

class AngryPerson extends Person {
  constructor(name, phrase) {
    super(name);
    this.phrase = phrase
  }
  sayHi() {
    console.log('I just fucking hate you all');
  }
  saySomethingElse() {
    console.log(this.phrase);
  }
}


Jim = new Person('Jim'); 
// Object { name: "Jim" }

Jim.sayName(); 
// My name is Jim!

Jim.sayHi(); 
// Hello everybody!

Jim.saySomethingElse(); 
// TypeError: Jim.saySomethingElse is not a function 


Bob = new AngryPerson('Bob', 'Please, leave me alone'); 
// Object { name: "Bob", phrase: "Please, leave me alone" }

Bob.sayName();
// My name is Bob!

Bob.sayHi();
// I just fucking hate you all

Bob.saySomethingElse();
// Please, leave me alone

<?php

/* attributes check */

if (!isset($_POST['some_attribute']) || empty($_POST['some_other_attribute'])) {
	echo 'false';
	exit();
}

/* attributes bindings */

$some_attribute = htmlspecialchars($_POST['some_attribute']);
$some_other_attribute = htmlspecialchars($_POST['some_other_attribute']);

/* quality attribute check */

if (strlen($some_attribute) > 10 || strlen($some_other_attribute) > 120) {
	echo 'false';
	exit();
}

$email = 'test@test.com'

$title = '=?utf8?b?' . base64_encode('some title') . '?=';

$ip = $_SERVER["REMOTE_ADDR"];

/* some hoster (and some php versions) may support date or current_time */

$date = date('d.m.Y H:i:s'); 
//$date = current_time('d.m.Y H:i:s', 0);

$headers  = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=UTF-8' . "\r\n";
$headers .= 'From: from somewhere <'.$email.'>' . "\r\n";
$headers .= 'X-Mailer: PHP/' . phpversion();

$html = '<p>Hello! It is a sample email, enjoy!</p>';

if(mail($email, $title, $html, $headers)) {
	echo 'true';
} else {
	echo 'false';
}