Create a class that inherits from a parent class

Define a class that inherits from another

class MyChildClass extends MyParentClass
{
  function MyChildFunction()
  {
    return "abc";
  }
}

Now, objects of class MyChildClass can call MyChildFunction(), but objects of MyParentClass can’t.

Overriding functions in a parent class

class MyChildClass extends MyParentClass
{

  //Override parent class function MyParentFunction()
  function MyParentFunction()
  {
    return "abc";
  }


  //If we wanted to call the function in the parent class
  function SomeChildFunction()
  {
    $Something = parent::MyParentFunction();
  }
}

Protected members

Members (variables, functions, etc) can be defined with one of the following protection levels:

public      //(Default) Can be accessed inside and outside the class
protected   //Can be accessed inside the class and any child class only (not outside the class)
private     //Can be accessed inside the class only (not by a child class or outside the class)