连接数据库

1、

      class mysql{

                  __construct([string hjost [,string username[,string password[, string dbname

                 [,int port[,string socket]]]]]]])

                 }

2、

       $mysqli = new mysqli("localhost","mysql_user","mysql_password","dbname");

3、

     <?php

        //创建mysqli对象

        $mysqli = new mysqli();

       //连接指定的MySQL数据库服务器

       $mysqli->connect("localhost","mysql_user","mysql_password");

      //选择特定的数据库

      $mysqli->select_db("dbname");

   ?>