OOP -> Instantiation

Instantiation provide a mechanism of OOP to use to class's again and again.

OR 

To use data-member or member function, we have to create an instance of the class.

Following are the example to create the object of class in different types

class Emp{
  public $totalEmp;
  function __construct($totalEmp=10){
    $this->totalEmp = $totalEmp;
  }
  function setTotalEmp($totalEmp){
    $this->totalEmp = $totalEmp;  
  }
  function getTotalEmp($totalEmp){
    return $this->totalEmp;  
  }  
}

/** first way to create obj **/
$emp1 = new Emp;
echo $emp1->totalEmp;
echo '
';

/** second way  to create obj **/
$emp2 = new Emp();
echo $emp2->totalEmp;
echo '
';

/** third way to create obj **/
$emp3 = new Emp(30);
echo $emp3->totalEmp;