$host = ‘localhost‘;
$user = ‘root‘;
$password = ‘root‘;

// 创建连接
$conn = @new mysqli($host, $user, $password);

 
// 检测连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}else{
    echo "连接成功";
} 

$host = ‘localhost‘;
$user = ‘root‘;
$password = ‘root22‘;

//创建连接
$conn = @mysqli_connect($host,$user,$password);
if($conn)
{
    echo ‘连接服务器成功‘;
}else
{
    echo ‘连接服务器失败‘.mysqli_error();
}