<?php
class MyClass
{
    public $a = 10;
    public $b = 20;

    public function __construct($a, $b)
    {
        $this->a = $a;
        $this->b = $b;
    }

    public function sayHello()
    {
        echo "Ciao {$this->a} {$this->b}.";
    }
}

$myClass = new MyClass('Jacopo', 'Mucci');
$myClass->sayHello();
?>