Constructor and Destructor

What is Constructor

The Constructor is a class function called automatically when an instance is created for that class. The Destructor is a function that is invoked when the class instance is destroyed. In PHP, the constructor and the destructor are defined by using the magic functions __construct() and __destruct() respectively. The following code shows an example with the class constructor used to initialize its private property.

Constructor types:

• Default Constructor: It has no parameters, but the values to the default constructor can be passed dynamically.
• Parameterized Constructor: It takes the parameters, and also you can pass different values to the data members.
• Copy Constructor: It accepts the address of the other objects as a parameter.

Example Of Constructor

<?php
class Car{
    private $modal;
    function __construct() {
        $this->modal = array("Alto","I10", "Audi");
    }
    function getAllModal() {
        foreach($this->modal as $modal) {
            print $modal . "<br/>";
        }
    } 
}

$carObj= new Car();
echo "<b>All Modals:</b><br/>";
$carObj->getAllModal();
?>

What is Destructor: 

Destructor is also a special member function which is exactly the reverse of the constructor method and is called when an instance of the class is deleted from the memory. 

Example Of Destructor

<?php
class Car{
    private $modal;
    function __construct() {
        $this->modal = array("Alto","I10", "Audi");
    }
    function getAllModal() {
        foreach($this->modal as $modal) {
            print $modal . "<br/>";
        }
    } 
    function __destruct(){ 
      echo "destroying " . $this->name . "\n"; 
    } 
}

$carObj= new Car();
echo "<b>All Modals:</b><br/>";
$carObj->getAllModal();
?>

Output:
Alto
In the constructor, destroying Class object!