"45.4. Usage Once we have defined our class and its constructors, we can create and use instances of it. With regular variables, we simply need to assign them to an instance of an object and their type will dynamically change to match. To create new instances, we invoke a constructor by using the new keyword and providing arguments to the constructor.\n\n1 $s = new Student(\"Alan\", \"Turing\", 1234, 3.4);\n\n2 $t = new Student(\"Margaret\", \"Hamilton\", 4321, 3.9);\n\n3 $u = new Student(\"John\", \"Smith\");\n\nThe process of creating a new instance by invoking a constructor is referred to as instantiation. Once instances have been instantiated, they can be used by invoking their methods via the same arrow operator we used to access member variables. Outside the class, however this will only work if the member method is public.\n\n1 print $t->getFormattedName() . \"\n\n\";\n\n2\n\n3 if($s->getGpa() < $t->getGpa()) {\n\n4 print $t->getFirstName() . \" has a better GPA\n\n\";\n\n5 }"