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Function that does language negotiation based on the Accept-Language

Function that does language negotiation based on the Accept-Language
header, a cookie or host name

<?php 

$supported_languages = array( 
    "no" => 1,    /* Norwegian */ 
    "en" => 1     /* English */ 
); 

$default_language = "en"; 

/* Try to figure out which language to use. 
*/ 
function negotiate_language($lang) { 
    global $supported_languages, $HTTP_ACCEPT_LANGUAGE; 

    if (isset($supported_languages[$lang])) { 
        return $lang; 
    } 

    /* If the client has sent an Accept-Language: header, 
     * see if it is for a language we support. 
     */ 
    if ($HTTP_ACCEPT_LANGUAGE) { 
        $accepted = explode( ",", $HTTP_ACCEPT_LANGUAGE); 
        for ($i = 0; $i < count($accepted); $i++) { 
            if ($supported_languages[$accepted[$i]]) { 
                return $accepted[$i]; 
            } 
        } 
    } 

    /* One last desperate try: check for a valid language code in the 
     * top-level domain of the client's source address. 
     */ 
    if (eregi( "\\.[^\\.]+$"", $REMOTE_HOST, &$arr)) { 
        $lang = strtolower($arr[1]); 
        if ($supported_languages[$lang]) { 
            return $lang; 
        } 
    } 

    global $default_language; 
    return $default_language; 
} 

?>

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