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language negotiation

negotiates a common *language* between apache and a browser

Info

Source Code ( 48 lines )

// language.php

// notes
//   - language codes are from ISO 639

// language_accept():
//   takes a list of languages the current document is 
//   available in as a parameter, and returns either a 
//   language that the browser and server have in common, 
//   or an empty string if no match was found
// parameters:
//   $accept - array of language codes to accept
// returns: negotiated language code or ''
function language_accept($accept='') {
    global $HTTP_ACCEPT_LANGUAGE;
    global $HTTP_ACCEPT_CHARSET;

    $lang=split(',', $HTTP_ACCEPT_LANGUAGE);

    // parse http_accept_language header
    foreach($lang as $i=>$value) {
        $value=split(';', $value);
        $lang[$i]=trim($value[0]);
        }

    return language_negotiate($lang, $accept);
    }

// language_negotiate():
//   finds a matching language between the two arrays. Tries 
//   to match whole language code, then first two characters 
//   (ie. 'en-us', 'en')
// parameters:
//   $ask_lang - array of language codes the browser wants
//   $accept_lang - array of language codes this document is available in
// returns: language code or ''
function language_negotiate($ask_lang, $accept_lang) {
    if (!(is_array($ask_lang) && is_array($accept_lang))) return '';

    // if it exists exactly, or just the first two characters
    foreach($ask_lang as $lang) {
        if (in_array($lang, $accept_lang)) return $lang;
        $short_lang=substr($lang, 0, 2);
        if (in_array($short_lang, $accept_lang)) return $short_lang;
        }

    return '';
    }