abstrak：<?php namespace app\index\controller; //單例模式:一個類只允許被實例化一次 class Database { private function __construct() {
<?php
namespace app\index\controller;
//單例模式:一個類只允許被實例化一次
class Database
{
private function __construct()
{
}
private function __clone()
{
// TODO: Implement __clone() method.
}
protected static $instance = null;
public static function getInstance(){
if(is_null(static::$instance)){
static::$instance = new static();
}
return static::$instance;
}
}
$connect3 = Database::getInstance();
$connect4 = Database::getInstance();
echo ($connect3 instanceof Database)?'是':'不是';
echo '<hr>';
echo ($connect4 instanceof Database)?'是':'不是';
echo '<hr>';
echo ($connect3 === $connect4)?'=':'不=';
Guru membetulkan：查無此人Masa pembetulan：2019-05-09 13:59:28
Rumusan guru：完成的不錯。編程有很多編程模式，多了解，能更好的學習。繼續(xù)加油。