写一个完整的PDO连接数据库的小案例(MySQL)

<?php

$type = 'mysql';

$host = '127.0.0.1';

$dbname = 'testdb';

$charset = 'utf8';

$port = 3306;

$user = 'root';

$pass = 'root';

$dsn = $type.':host='.$host.';dbname='.$dbname.';$charset='.$charset;

try{

$pdo = new PDO($dsn,$user,$pass); //连接

echo '链接成功','<br/>';

$pdo = null; //断开

var_dump($pdo);

}catch(PDOException $e){

echo '链接失败，原因：'. $e->getMessage();

}