Under what circumstances should we make a class constructor private
constructor, oop, php
Solution
When do we have to define a private constructor?
class smt
{
private static $instance;
private function __construct() {
}
public static function get_instance() {
{
if (! self::$instance)
self::$instance = new smt();
return self::$instance;
}
}
}
What's the purpose of using a private constructor?
It ensures that there can be only one instance of a Class and provides a global access point to that instance and this is common with The Singleton Pattern.
What are the pros & cons of using a private constructor?
Are Singletons really that bad?
What is so bad about singletons?
Problem
Possible Duplicate: In a PHP5 class, when does a private constructor get called? I have been reading about OOP recently and came across this private constructor scenario. I did a Google search, but couldn't find anything relevant to PHP. In PHP - When do we have to define a private constructor? - What's the purpose of using a private constructor? - What are the pros & cons of using a private constructor?