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PHP Development Guide: Implementing simple multi-language switching function

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Release： 2023-07-01 20:58:37

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PHP Development Guide: Implementing simple multi-language switching function

Introduction:
With the development of the Internet, more and more websites and applications need to support multi-language functions. In web development, implementing multi-language switching function is a very important task. This article will introduce how to use PHP to implement a simple multi-language switching function, and provide code examples for developers to refer to.

1. Preparation work
Before we start to implement the multi-language switching function, we need to do some preparation work. First, we need to determine the supported languages and create the corresponding language files. Generally, the translated text of each language is saved in a separate language file to facilitate maintenance and management.

For example, create a "languages" folder in the project root directory, and create language files in this folder: en.php, zh.php, fr.php, etc. Define an array containing translated text in each language file, for example:

en.php:

return [
    'welcome' => 'Welcome',
    'hello' => 'Hello',
    'goodbye' => 'Goodbye'
];

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zh.php:

return [
    'welcome' => '欢迎',
    'hello' => '你好',
    'goodbye' => '再见'
];

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fr.php:

return [
    'welcome' => 'Bienvenue',
    'hello' => 'Bonjour',
    'goodbye' => 'Au revoir'
];

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2. Implement multi-language switching function

Set the default language
In the PHP code, we can define a global variable to save the currently selected language. For example:

$language = 'en';

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By default, we set the language to English.

Reading language files
In order to dynamically switch languages at runtime, we need to write a function to read the corresponding language file. We can create a function getTranslations($lang), where $lang is the language type to be read. In this function we will load the corresponding language file based on the value of $lang and return an array containing the translated text. For example:

function getTranslations($lang) {
    $translations = [];
    $file = __DIR__ . '/languages/' . $lang . '.php';
    if (file_exists($file)) {
        $translations = require_once($file);
    }
    return $translations;
}

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Implementing the language switching function
In the HTML page, we can obtain the translated text in the specified language by calling the getTranslations function. And the user-selected language type can be passed using the $_GET parameter or other means. For example:

if (isset($_GET['lang'])) {
    $language = $_GET['lang'];
}
$translations = getTranslations($language);

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Use the obtained translated text to replace it in the page. For example:

<h1><?php echo $translations['welcome']; ?></h1>
<p><?php echo $translations['hello']; ?></p>
<p><?php echo $translations['goodbye']; ?></p>

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3. Example Demonstration
The following is a simple example that demonstrates how to implement multi-language switching function in a simple PHP application.

index.php:

<?php
function getTranslations($lang) {
    $translations = [];
    $file = __DIR__ . '/languages/' . $lang . '.php';
    if (file_exists($file)) {
        $translations = require_once($file);
    }
    return $translations;
}

$language = 'en'; // 默认语言为英文
if (isset($_GET['lang'])) {
    $language = $_GET['lang'];
}

$translations = getTranslations($language);
?>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>多语言切换示例</title>
</head>
<body>
    <h1><?php echo $translations['welcome']; ?></h1>
    <p><?php echo $translations['hello']; ?></p>
    <p><?php echo $translations['goodbye']; ?></p>

    <ul>
        <li><a href="?lang=en">English</a></li>
        <li><a href="?lang=zh">中文</a></li>
        <li><a href="?lang=fr">Français</a></li>
    </ul>
</body>
</html>

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Conclusion:
Through the above code examples, we are familiar with how to use PHP to implement a simple multi-language switching function. Developers can further expand and optimize according to actual needs to achieve more complex functions. I hope this article will help you understand and master multi-language switching.

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