php构造函数连接数据库

index.php

require_once("mysql.config.php");
require_once("mysql.class.php");

echo $data->f();

config.php

<?php
/*
 * Time 2014-03-31
 * Author Sky
 * 数据库基本信息
 */
$arr = include('../Cache/config.php');        //  连接 Yourphp的配置文件

$db_host = $arr['DB_HOST'];
$db_name = $arr['DB_NAME'];
$db_user = $arr['DB_USER'];
$db_pwd = $arr['DB_PWD'];
$db_preefix = $arr['DB_PREFIX'];

?>

class.php

<?php
class Data{
    public $DB_HOST;
    public $DB_NAME;
    public $DB_USER;
    public $DB_PWD;
    public $DB_PREFIX;

    function __construct($DB_HOST,$DB_NAME,$DB_USER,$DB_PWD,$DB_PREFIX){
        $this->DB_HOST = $DB_HOST;
        $this->DB_NAME = $DB_NAME;
        $this->DB_USER = $DB_USER;
        $this->DB_PWD = $DB_PWD;
        $this->DB_PREFIX = $DB_PREFIX;

        //***  连接数据库
        $con = mysql_connect($DB_HOST,$DB_USER,$DB_PWD);
        if (!$con)
        {
          die('数据库连接失败' . mysql_error());
        }
        mysql_select_db($DB_NAME, $con);
        mysql_query('set names utf8');
    }

    function insert(){
            echo '';
    }

}
$data = new Data($db_host,$db_name,$db_user,$db_pwd,$db_preefix);
?>