调用成员函数query（）

Question

我正在忙于投票脚本，但是当我想投票时遇到问题，我收到一个错误消息：

Fatal error: Call to a member function query() on a non-object in在第7行Fatal error: Call to a member function query() on a non-object in上Fatal error: Call to a member function query() on a non-object in

<?php
include '../config.php';
function getAllVotes($id)
{
    $votes = array();
    if($q_13 = "SELECT * FROM post WHERE id = $id");
    if($r_26 = $db->query($q_13));
?>

这是我的config.php

<?php

$db = new mysqli('localhost', 'root', 'mysql', 'me');

if($db->connect_errno) {
    die('Sorry, we are having some problems.');
}

？>

Answer 1

这是一个范围问题，您需要将$db作为参数传递给getAllVotes() 。

像这样...

function getAllVotes(mysqli $db, $id) //<---- Pass $db here
{