classes_notes.php

<?

//Taken from: http://net.tutsplus.com/tutorials/php/object-oriented-php-for-beginners/


class MyClass{                  //Creating a class
        //class properties and methods go here
        public $prop1 = "I'm a class property!";//the word "public" defines the visibility of a class property
	public static $count = 0;


        public function __construct(){//This magic method is trigged once a new object is created
                echo 'The class"', __CLASS__, '" was initiated!<br />';
		//echo "hola <br />";
        }
        public function __destruct(){//This magic method is trigged once the object
                //echo 'This class was destroyed <br />';
		echo "destroyed <br />";
        }
	public function __tostring(){//This method allows you to return the object as a string
		return "";
	}
        public function setProperty($newval){
                $this->prop1 = $newval;                 //Inside the class we call the object with "this" word
        }
	public static function plusOne(){//an static method that uses an autoincrement variable operator called self
		return "The count is". ++self::$count. "<br />";
	}
        protected function getProperty(){
                return $this->prop1 . "<br />";
        }
}
//$obj = new MyClass;
//echo 'destination" ', $obj, ' "I know';
//$obj->setProperty("This is the new name of my property");
//echo $obj->getProperty();
//echo $obj;
//unset($obj);//This method destroyes the object inmediatly
//echo "This is the end of the class <br />";

//--------------------------------INHERINANCE-----------------------------------

//Inheritance uses the word extends to indicate that the current class inherit from a class existent
//For instance the class myOtherlass inherit properties and functions from the class MyClass
class myOtherClass extends MyClass{
 public function setProperty(){//Overwriting a method
  return $this->prop1 . "<br />";
 }

//Adding functions to an existing method preserving the old ones
//we do this by means of "::" sintax
public function __construct(){
	parent::__construct();// Call the parent class's constructor
	echo "A new constructor in ". __CLASS__ .".<br />";
}
public function callProperty(){
	return $this->getProperty();
}
}

//$myOtherObject->setProperty("This is the other object using methods and properties from MyClass class");
//echo $myOtherObject->setProperty();

//----------------------Satatic functions or properties-------------------------------

/*One function or property declarated as static can be accesed without instancing the class,
static methods allows you to keeep the stored values for the duration of the script

This method or property can be called by NameOfMyClass::$name_of_my_object_/Property()
*/

//Calling the static method plusOne() and the static property $count

do{
	echo MyClass::plusOne();
}while( MyClass::$count < 10 );

?>