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PHP 操作数据库 PDO pdo 链接 mysql //PDO连接Mysql数据库 $dbms = 'mysql'; $dbname = 'demo1'; $host = 'localhost'; $user = 'root'; $pwd = 'root'; $dsn = "$dbms:host=$host;dbname=$dbname"; try { $pdo = new PDO($dsn, $user, $pwd); $pdo->exec("set names 'utf8