Knowledge Base

http_get_preferred_language()

Description

Use the browser settings to determine the default / preferred language

Parameters

Column	Type	Default	Description
$strict_mode	boolean	false

Return

string

The language string the user may prefer

Location

include/language_functions.php lines 553 to 602

Definition

 
function http_get_preferred_language($strict_mode = false)
{
    global $languages;

    if (empty($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
        return null;
    }

    $accepted_languages = preg_split('/,\s*/', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
    $current_lang = false;
    $current_quality = 0;
    $language_map = array();

    foreach ($languages as $key => $value) {
        $language_map[strtolower($key)] = $key;
    }

    foreach ($accepted_languages as $accepted_language) {
        $res = preg_match('/^([a-z]{1,8}(?:-[a-z]{1,8})*)(?:;\s*q=(0(?:\.[0-9]{1,3})?|1(?:\.0{1,3})?))?$/i', $accepted_language, $matches);

        if (!$res) {
            continue;
        }

        $lang_code = explode('-', $matches[1]);

        // Use specified quality, if any
        if (isset($matches[2])) {
            $lang_quality = (float)$matches[2];
        } else {
            $lang_quality = 1.0;
        }

        while (count($lang_code)) {
            $short = strtolower(join('-', $lang_code));
            if (array_key_exists($short, $language_map) && $lang_quality > $current_quality) {
                $current_lang = $language_map[$short];
                $current_quality = $lang_quality;
            }

            if ($strict_mode) {
                break;
            }

            array_pop($lang_code);
        }
    }

    return $current_lang;
}


This article was last updated 5th May 2024 11:05 Europe/London time based on the source file dated 3rd May 2024 14:45 Europe/London time.