Are there any recommended online books or tutorials for PHP 5 object-oriented programming?

There are several recommended online books and tutorials for PHP 5 object-oriented programming. Some popular resources include "PHP Objects, Patterns, and Practice" by Matt Zandstra, "PHP 5 Power Programming" by Andi Gutmans, Stig Bakken, and Derick Rethans, and the official PHP documentation on object-oriented programming. These resources cover topics such as classes, objects, inheritance, polymorphism, and more. One of the best ways to learn object-oriented programming in PHP is to practice writing code. Here is a simple example of a PHP class that demonstrates the basics of object-oriented programming:

<?php
class Person {
    public $name;
    public $age;

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

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

$person1 = new Person("John", 30);
$person1->greet();
?>