How does PHP handle class definitions?

PHP handles class definitions by using the `class` keyword followed by the class name and curly braces containing the class properties and methods. It is important to define classes before instantiating objects of those classes to avoid any errors. Additionally, PHP allows for inheritance, interfaces, and abstract classes to create more complex class structures.

// Example of defining a simple class in PHP
class MyClass {
    public $property;

    public function myMethod() {
        // Method implementation
    }
}