php
$host="localhost";
$username="root";
$password="123456";
$dbname="PHP";
$connID=mysqli_connect($host...,$username,$password);
if (mysqli_select_db($connID,$dbname)) {
echo "数据库连接成功";
}
else
{
echo..."数据库连接失败";
}
?...php
define('host','localhost');
define('user','root');//数据库用户名 root
define('pwd','123456');//数据库密码
define...('db','PHP');//数据库名
$conn = new mysqli(host,user,pwd,db);
if ($conn->connect_error){
die("连接失败：".
