How to use PHP to implement multi-language website functions

How to use PHP to implement multi-language website functions
In today's globalized world, developing multi-language websites has become a necessary requirement. As a commonly used programming language, PHP can easily implement multi-language website functions. This article will introduce how to use PHP to implement multi-language website functions and provide corresponding code examples.

1. Create language files
First, you need to create language files in different languages. Each language file stores text translations for the corresponding language in the form of an array. For example, the language file of an English website can be named en.php, and the language file of a Chinese website can be named zh.php.

Sample code:
en.php

return [
    'welcome' => 'Welcome',
    'login' => 'Login',
    'logout' => 'Logout',
    'home' => 'Home',
    // ...
];

zh.php

return [
    'welcome' => '欢迎',
    'login' => '登录',
    'logout' => '退出',
    'home' => '首页',
    // ...
];

2. Set the language switching function
In the navigation bar of the website or other appropriate Location, add language switching function. By clicking on the different language icons, you can switch the language of the website.

Sample code:

<?php
    // 获取当前语言
    $currentLanguage = isset($_COOKIE['language']) ? $_COOKIE['language'] : 'en';

    // 根据语言切换链接设置不同的语言Cookie
    function setLanguageCookie($language) {
        setcookie('language', $language, time() + 3600, '/');
    }
?>

<!-- 语言切换链接 -->
<a href="?language=en" onclick="setLanguageCookie('en')">English</a>
<a href="?language=zh" onclick="setLanguageCookie('zh')">中文</a>

3. Output the translation text according to the language file
According to the current language, read the corresponding language file and output the corresponding translation text.

Sample code:

<?php
    $language = isset($_COOKIE['language']) ? $_COOKIE['language'] : 'en';

    // 根据语言文件获取对应的翻译文本
    function __($key) {
        global $language;
        $translation = require_once($language . '.php');
        return isset($translation[$key]) ? $translation[$key] : $key;
    }
?>

<!-- 输出翻译文本 -->
<h1><?php echo __('welcome'); ?></h1>
<p><?php echo __('login'); ?></p>
<button><?php echo __('logout'); ?></button>

4. Implement dynamic language switching function
In addition to static language switching, we can also implement dynamic language switching function. By adding a language setting option to the website's backend management system, administrators can switch the website's language in real time.

Sample code:

<?php
    // 读取后台语言设置
    $adminLanguage = 'en'; // 假设后台设置为英文

    // 判断是否为管理员
    function isAdmin() {
        // TODO: 实现管理员判断逻辑
        return false;
    }

    // 根据管理员语言切换网站语言
    if(isAdmin()) {
        $language = $adminLanguage;
    } else {
        $language = isset($_COOKIE['language']) ? $_COOKIE['language'] : 'en';
    }
?>

The above is a way to use PHP to implement multi-language website functions. By creating a language file, setting the language switching function, and outputting translated text based on the language file, we can easily implement a multilingual website. At the same time, the dynamic language switching function allows website administrators to switch the language of the website at any time to adapt to the needs of different users. I hope this article will be helpful to you when developing multilingual websites.

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