首次加载时出现 Codeigniter 'Message: Undefined index: site_lang' 问题

Question

我开发了一个网站，它在我的本地主机上运行良好。但是我想在上线前在局域网中测试一下。我面临的一个问题是，首先在浏览器或任何其他机器中加载它会显示以下错误，直到我更改语言一次。当我更改一次语言时，问题就再也不会发生了。我是新手，这是我的第一个项目，所以任何人都可以在这方面帮助我。提前致谢

遇到了一个PHP错误

Severity: Notice

Message: Undefined index: site_lang

Filename: models/companies.php

Line Number: 15

回溯：

File: C:\xampp\htdocs\fp\application\models\companies.php
Line: 15
Function: _error_handler

File: C:\xampp\htdocs\fp\application\controllers\home.php
Line: 19
Function: get_companies

File: C:\xampp\htdocs\fp\index.php
Line: 315
Function: require_once

这是我的模型：

 //---- Table Companies ---
public function get_companies()
{   
    // Retrieve titles for all languages 
    $sql = "SELECT * FROM `ci_companies` WHERE `co_id` = 1"; 
    // Retrieve appropriate title according to the chosen language in the system 
    $sql = "SELECT `co_id`, `co_name`, SUBSTRING(`co_detail`,1,100) AS `co_detail`, `co_img`, `co_img2` FROM `ci_companies` WHERE `co_lang` = '".$_SESSION['site_lang']."'";
    $query = $this->db->query($sql);
    return $query->result();
}

这是我的控制器：

function switchLang($language = "") {

    $language = ($language != "") ? $language : "english";
    $this->session->set_userdata('site_lang', $language);

    redirect($_SERVER['HTTP_REFERER']);

}

Answer 1

由于 single quotes.

的错误使用，请尝试 this.error

$language = $this->session->userdata('site_lang');//or $_SESSION['site_lang']

$sql = "SELECT `co_id`, `co_name`, SUBSTRING(`co_detail`,1,100) AS `co_detail`, `co_img`, `co_img2` FROM `ci_companies` WHERE `co_lang` = '{$language}'";

首次加载时出现 Codeigniter 'Message: Undefined index: site_lang' 问题

Codeigniter 'Message: Undefined index: site_lang' issue at first load

php

mysql

session

multilingual

codeigniter