未捕获错误：调用未定义函数getConnection（）

Question

I have this error message..try to extends class but nothing helps..in database.php i have function getConnection()

<?php
 require_once 'database.php';

 class userClass {

    /* User Login */

    public function userLogin($username, $password) { 

        try{

$db = getConnection();

Fatal error: Uncaught Error: Call to undefined function getConnection()

Answer 1

Since you have a Database class, you have to instanciate an object of this class first.
Based on the excerpt from your database.php

<?php
 require_once 'database.php';

 class userClass {

    /* User Login */

    public function userLogin($username, $password) { 

        try{

           $db = new Database();
           $conn = $db->getConnection();

           // ...
        }
    }
}