How Can I Reliably Detect Browser Language in PHP to Serve the Correct Page?

Detect Browser Language in PHP Made Robust

You have attempted to automatically include the appropriate page based on the browser's language in your PHP script. However, the script falters with certain browsers, consistently displaying the "index_en.php" page. To address this issue and enhance the reliability of your solution, consider implementing the following improvements:

lixlpixel_get_env_var($Var) should be modified to handle environments where $GLOBALS[$Var] may already be set.

Instead of iteratively searching for accepted languages using strpos, parse the HTTP_ACCEPT_LANGUAGE header into an array and check for a match.

Consider storing your available languages in a database or other structured data source instead of relying on the hard-coded array.

Implement a more robust fallback mechanism that includes a language priority list or redirects to a language selection page.

A Simplified Alternative

For a simpler approach, you could utilize the following script:

    $lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
    $acceptLang = ['fr', 'it', 'en']; 
    $lang = in_array($lang, $acceptLang) ? $lang : 'en';
    require_once "index_{$lang}.php"; 

This script retains the intended functionality of detecting the browser's language using the HTTP_ACCEPT_LANGUAGE header and loading the corresponding "index_xx.php" page. It employs PHP's native substr function to extract the first two characters of the language code. The $acceptLang array defines the accepted languages. If the detected language matches one in the array, it is used; otherwise, 'en' is assumed as the default. The require_once statement includes the appropriate "index_xx.php" file based on the detected language.

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