单例模式封装PDO链接数据库

使用单例模式封装PDO链接数据库

1、封装php Single 类

<?php
class Single
{
private static $_instance = null;
private function __construct(){}
private function __clone(){}
public static function getInstance()
 {
if (self::$_instance === null) {
self::$_instance = new Single();
 }
return self::$_instance;
 }
public function hehe($dbName){
return new PDO('mysql:host=localhost;dbname='.$dbName.';', 'root', 'root'); 
 }
}
?>

2、引用

<?php
require 'Single.class.php';
$db = Single::getInstance();
$pdo=$db->hehe('DBname');

$data=$pdo->query('desc tableName'/sql)->fetch();
var_dump($data);
die;
$db->destruct();
?>