Question

is there a way to prevent the instance of the same class in a PHP script?

$user = new User();


$user2 = new User();  // I want to catch another instance of the user class and throw an exception

I have tried creating a static variable and manipulating it with a static function:

User::instance()

but that doesn’t stop me from doing:

$user = new User();

Answer 1

<?php
class Foo {
  static function instance() {
    static $inst = null;
    if ($inst === null) { $inst = new self; }
    return $inst;
  }
  private function __construct() { }
  private function __clone() { }
}