PHP OOP

• OOP stands for Object Oriented Programming. OOP is more focused on writing classes and functions in it and creating objects that has access to both data and functions.
• Following are some advantages of OOP
  • Faster and easier to execution
  • Helps to keep the PHP code DRY Don't Repeat Yourself
• Here class is template of object and object is instance of class

class Person {
  public $name;
  public $age;

  function setName($name) {
    $this->name = $name;
  }

  function getName() {
    return $this->name;
  }
}

$john = new Person();
$john->setName('John');
echo $john->getName();

Constructor & Destructor

Constructor

• Constructor allows initialize an object properties upon creation of the object.
• In php __construct() function used to create constructor

class Person {
  public $name;
  public $age;

  public function __construct($name, $age) {
    $this->name = $name;
    $this->age = $age;
  }
}

$john = new Person('John', 18);
echo $john->name;
echo $john->age;

Destructor

• Destructor is called when the object is destructed or the script is stopped.
• In php __destruct() function is used to create a destructor
• __destruct() is automatically called when script ends
• Destructor can be used to release some resource and close IO or database connections

class Person {
  public $name;
  public $age;

  public function __construct($name, $age) {
    $this->name = $name;
    $this->age = $age;
  }

  public function __destruct() {
    echo "Releasing resources";
  }
}

Access Modifiers

• PHP provides following access modifiers which controls where the properties and functions are accessible
  • public: can be accessed from everywhere default access specifier
  • protected: can be accessed within the class and by classes derived from that class
  • private: can only be accessed within the class

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