How Can I Reliably Detect Browser Language in PHP?

Detect Browser Language in PHP: A Robust Solution

The provided PHP script encounters challenges in accurately detecting browser languages, often defaulting to "index_en.php" for all languages. To address this issue, a more comprehensive approach is required.

One robust solution is to utilize built-in PHP functions and a straightforward algorithm. The following script achieves this:

<?php
    // Extract the first two characters from the HTTP_ACCEPT_LANGUAGE header as the browser language.
    $lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);

    // Define a list of supported languages.
    $acceptLang = ['fr', 'it', 'en']; 

    // Check if the browser language is in the supported list.
    $lang = in_array($lang, $acceptLang) ? $lang : 'en';

    // Include the appropriate language-specific page.
    require_once "index_{$lang}.php"; 
?>

This script operates as follows:

1. It extracts the first two characters from the HTTP_ACCEPT_LANGUAGE header, which holds the preferred languages set by the browser.
2. It then compares this value with a predefined list of supported languages.
3. If the browser language is not supported, it defaults to English ("en").
4. Finally, it includes the corresponding language-specific page, such as "index_fr.php" for French or "index_en.php" for all other languages.

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