Community Learn Tools Library Leisure
search
English
Home > Backend Development > PHP Tutorial > PHP singleton mode entry example

PHP singleton mode entry example

WBOY
Release： 2016-07-25 08:51:49
Original
1189 people have browsed it
  2. class mysql{
  3. privete static $instance ;//Save the instance
  4. //The constructor is declared as private to prevent direct creation of objects
  5. privete function __construct(){
  6. //Instantiation
  7. }
  8. //Single case method, determine whether it has been instantiated, and only instantiate it once
  9. public static function getInstance (){
  10. if(!isset( self::$instance )){
  11. self ::$instance = new self();
  12. }
  13. return self:: $instance;
  14. }
  15. //Prevent cloning objects
  16. private function __clone (){
  17. trigger_error ("not allow to clone.");
  18. }
  19. function test(){
  20. echo "test" ;
  21. }
  22. }
  23. $conn = mysql::getInstance ();
  24. $conn->test ();
  25. ?>
Copy code


Related labels：
php单例模式入门例子
source：php.cn
Previous article：PHP image watermark class supports watermark transparency and background transparency Next article：PHP code to add watermark to multiple image uploads
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
I'm building three pages using React, each page has its own css file and there is only one css file for each page I'm working on these three pages: App.js has two buttons, when you click the first button ...
From 2024-04-04 10:07:16
0
1
394
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template