PHP 的单例模式代码
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class User {
static function getInstance()
{
if (self::$instance == NULL) { // If instance is not created yet,will create it.
self::$instance = new User();
}
return self::$instance;
}
private function __construct()
// Constructor method as private so by mistake developer not crate
// second object of the User class with the use of new operator
{
}
private function __clone()
// Clone method as private so by mistake developer not crate
//second object of the User class with the use of clone.
{
}
function Log($str)
{
echo $str;
}
static private $instance = NULL;
}
User::getInstance()->Log("Welcome User");
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