//单例模式，调用多次只new一次对象
class Test1{
    protected static  $tt;
    private function __construct(){}
    static function getInstance(){
        if(self::$tt){
            echo "对象已经创建<br>";
            return self::$tt;
        }else {
            self::$tt = new Test1();
            echo "创建对象<br>";
            return self::$tt;
        }
    }
    function echoHello(){
        echo "Hello<br>";
    }
}

$test = Test1::getInstance();
$test->echoHello();
$test = Test1::getInstance();
$test->echoHello();
$test = Test1::getInstance();
$test->echoHello();
$test = Test1::getInstance();
$test->echoHello();

文章来源: php单例模式

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