OOP in PHP

Class and Object

<?php
  class Student {
    public $name;
    public $marks;
    function __construct($name, $marks) {
      $this->name = $name;
      $this->marks = $marks;
    }
    function show() {
      echo "$this->name: $this->marks";
    }
  }
  $s = new Student("Aman", 88);
  $s->show();
?>

Inheritance

<?php
  class Person {
    function greet() { echo "Hi"; }
  }
  class Teacher extends Person {
    function teach() { echo " teaching"; }
  }
  $t = new Teacher();
  $t->greet();  // inherited
  $t->teach();
?>

Summary

• Define a class with fields, __construct and methods; create objects with new.
• Use $this-> for members and extends for inheritance.