Question

我正在使用以下代码

           # fetch these users.
            $statement = $conn->prepare('SELECT * FROM weenkDetails WHERE userId = :userId AND weenkedId IN (' . implode(',', $userIds) . ')'); 
            $statement->bindParam(':userId'    , $userId, PDO::PARAM_STR);
            $statement->execute();

            while ($newRow = $statement->fetch(PDO::FETCH_ASSOC))
            {
                $weenks[] = $newRow;
            }
            # assign weenks to users.
            # assign users to posts.
            foreach ($users as $index => $user)
            {
                $users[$index]['weenk'] = "null";
                foreach ($weenks as $weenk)
                {
                    if ($user['id'] == $weenk['weenkedId'])
                    {
                        $users[$index]['weenk'] = $weenk;
                        break;
                    }
                }
            }

            $statement = $conn->prepare('SELECT * FROM weenkDetails WHERE weenkedId = :userId AND type = 2 AND userId IN (' . implode(',', $userIds) . ')');
            $statement->bindParam(':userId'    , $userId, PDO::PARAM_STR);
            $statement->execute();
            $newWeenks[] = array();
            while ($newRow = $statement->fetch(PDO::FETCH_ASSOC))
            {
                $newWeenks[] = $newRow;
            }

            # assign weenks to users.
            # assign users to posts.
            foreach ($users as $index => $user)
            {
                foreach ($newWeenks as $weenk)
                {
                    if ($user['id'] == $weenk['userId'])
                    {
                        $users[$index]['weenk'] = $weenk;
                        break;
                    }
                }
            }

最初作为测试用例，我的$ weenks []和$ newWeenks []是空数组。

foreach ($users as $index => $user)
                {
                    $users[$index]['weenk'] = "null";
                    foreach ($weenks as $weenk)
                    {
                        if ($user['id'] == $weenk['weenkedId'])
                        {
                            $users[$index]['weenk'] = $weenk;
                            break;
                        }
                    }
                }

这里一切正常，阵中没有任何事情发生

但稍后在这里

foreach ($users as $index => $user)
                {
                    foreach ($newWeenks as $weenk)
                    {
                        if ($user['id'] == $weenk['userId'])
                        {
                            $users[$index]['weenk'] = $weenk;
                            break;
                        }
                    }
                }

它为$ weenk

提供了错误未定义索引userId

我已经检查过newWeenks是EMPTY返回它给[]然后它怎么进入循环？为什么我在这里得到这个错误而不是在上面的循环？

我的表格包含id userId weeenkedId type

Answer 1

你的init数组设置不好，你有：$newWeenks[] = array();

您必须拥有：$newWeenks = array();

空数组php中未定义的userId

1 个答案: