In PHP, objects are they passed by value or by reference?

In PHP, objects are passed by reference by default. This means that when you pass an object as an argument to a function or assign it to a new variable, both the original variable and the new one refer to the same object in memory.

Here's an example to illustrate this:

class Person {
    public $name;

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

$person1 = new Person("John");
$person2 = $person1;

echo $person1->name; // Output: John
echo $person2->name; // Output: John

$person2->name = "Jane";

echo $person1->name; // Output: Jane
echo $person2->name; // Output: Jane

In this example, when we assign $person1 to $person2...