Example of php singleton pattern
Release： 2016-07-25 09:10:20
Original
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/** - * by bbs.it-home.org
- * 2012-12-26
- */
- class Mysql{
- //This attribute is used to save the instance
- private static $conn;
- //The constructor is private, Prevent the creation of objects
- private function __construct(){
- $this->conn = mysql_connect('localhost','root','');
- }
- //Create a method for instantiating objects
- public static function getInstance(){
- if(!(self::$conn instanceof self)){
- self::$conn = new self;
- }
- return self::$conn;
- }
- //Prevent the object from being copied
- public function __clone(){
- trigger_error('Clone is not allowed!');
- }
} - //You can only get the instance in this way, not new and clone
- $mysql = Mysql:: getInstance();
- ?>
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