您好，我正在尝试将 mysql 更改为 mysqli，但我的脚本无法正常工作。更改为 mysqli 后
数据库.php
<?php
include("constants.php");
class MySQLDB
{
var $connection; //The MySQL database connection
var $num_active_users; //Number of active users viewing site
var $num_active_guests; //Number of active guests viewing site
var $num_members; //Number of signed-up users
/* Note: call getNumMembers() to access $num_members! */
/* Class constructor */
function MySQLDB(){
/* Make connection to database */
$this->connection= mysqli_connect(DB_SERVER, DB_USER, DB_PASS,DB_NAME);
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
} …