What are the differences in handling classes between PHP and JavaScript?

In PHP, classes are defined using the `class` keyword followed by the class name. Properties are declared using `public`, `private`, or `protected` keywords. In JavaScript, classes are defined using the `class` keyword as well, but properties are declared inside the constructor function using the `this` keyword. Additionally, PHP supports inheritance through the `extends` keyword, while JavaScript uses the `extends` keyword as well but with a slightly different syntax. 

<?php

class Person {
    public $name;
    public $age;

    public function __construct($name, $age) {
        $this->name = $name;
        $this->age = $age;
    }

    public function greet() {
        return "Hello, my name is {$this->name} and I am {$this->age} years old.";
    }
}

$person = new Person('John', 30);
echo $person->greet();

?>

Keywords

PHP JavaScript class handling object-oriented programming inheritance

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