How to create and use objects

$objectName = new ClassName(argumentList);

object $brass = new Category(4, 'Brass');

$trumpet = new Product($brass, 'Getzen', 'Getzen 700SP Trumpet', 999.95);

$objectName->propertyName = value;

$objectName->propertyName;

$trumpet->comment = 'Discontinued';

echo $trumpet->comment;

$objectName->methodName(argumentList);

$price = $trumpet->getFormattedPrice();

echo $trumpet->getCategory()->getName();

Description

• An object is an instance of a class. In other words, you can create more than one object from a single class. The process of creating an object from a class is sometimes called instantiation.
• To create an object, you code the new keyword followed by the name of the class and a set of parentheses. Inside the parentheses, you code the arguments for the constructor separated by commas.
• To access an object’s property, you code a reference to the object followed by the object access operator (->) and the name of the property.
• To call an object’s method, you code a reference to the object followed by the object access operator (->), the name of the method, and a set of parentheses. Inside the parentheses, you code the arguments for the method separated by commas.
• If a function or method returns an object, you can use the function or method call as a reference to the object and continue accessing the returned object’s properties and methods. This is called object chaining.