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What is the difference between constructor and destructor in php

Jun 30, 2020 am 11:28 AM
phpConstructordestructor

The difference between constructors and destructors in php is: 1. The constructor can receive parameters and can be assigned to object properties when creating an object. The destructor cannot take parameters; 2. The constructor is called when creating an object. Function, the destructor is automatically called when the object is destroyed.

What is the difference between constructor and destructor in php

Difference analysis:

Constructor

Classes with a constructor will first call this method each time an object is created.

void __construct ([ mixed $args [, $... ]] )
  • The constructor can receive parameters and can be assigned to object properties when creating the object

  • The constructor can call class methods or other functions

  • The constructor can call the constructor of other classes

Example

<?php
class BaseClass {
   function __construct() {
       print "In BaseClass constructor\n";
   }
}

class SubClass extends BaseClass {
   function __construct() {
       parent::__construct();
       print "In SubClass constructor\n";
   }
}

$obj = new BaseClass();
$obj = new SubClass();
?>

Destructor

void __destruct ( void )
  • The destructor is in When the object is destroyed, it is called automatically and cannot be called explicitly.

  • The destructor cannot take parameters

Example:

<?php
class MyDestructableClass {
   function __construct() {
       print "In constructor\n";
       $this->name = "MyDestructableClass";
   }

   function __destruct() {
       print "Destroying " . $this->name . "\n";
   }
}

$obj = new MyDestructableClass();
?>

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