Can PHP4 effectively support object-oriented programming, or are there limitations?

PHP4 does support object-oriented programming, but it has limitations compared to newer versions of PHP. Some of the limitations include lack of visibility keywords like public, private, and protected, limited support for inheritance, and no support for interfaces. To work around these limitations, developers can still use basic object-oriented principles like creating classes, defining methods, and properties, but they may need to implement workarounds for more advanced features.

// Example of basic object-oriented programming in PHP4
class Person {
    var $name;
    
    function setName($name) {
        $this->name = $name;
    }
    
    function getName() {
        return $this->name;
    }
}

$person = new Person();
$person->setName('John Doe');
echo $person->getName(); // Output: John Doe