(PECL pecl_http >= 0.1.0)
http_negotiate_language — Negotiate client's preferred language
$supported
[, array &$result
] )This function negotiates the clients preferred language based on its Accept-Language HTTP header. The qualifier is recognized and languages without qualifier are rated highest. The qualifier will be decreased by 10% for partial matches (i.e. matching primary language).
supported
array containing the supported languages as values
result
will be filled with an array containing the negotiation results
Returns the negotiated language or the default language (i.e. first array entry) if none match.
Example #1 Using http_negotiate_language()
<?php
$langs = array(
'en-US',// default
'fr',
'fr-FR',
'de',
'de-DE',
'de-AT',
'de-CH',
);
include './langs/'. http_negotiate_language($langs, $result) .'.php';
print_r($result);
?>
Anonymous (2008-11-03 15:23:48)
as I don't have this function available I tried to write it myself. Maybe useful for someone else, too.
<?php
/*
determine which language out of an available set the user prefers most
$available_languages array with language-tag-strings (must be lowercase) that are available
$http_accept_language a HTTP_ACCEPT_LANGUAGE string (read from $_SERVER['HTTP_ACCEPT_LANGUAGE'] if left out)
*/
function prefered_language ($available_languages,$http_accept_language="auto") {
// if $http_accept_language was left out, read it from the HTTP-Header
if ($http_accept_language == "auto") $http_accept_language = isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) ? $_SERVER['HTTP_ACCEPT_LANGUAGE'] : '';
// standard for HTTP_ACCEPT_LANGUAGE is defined under
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4
// pattern to find is therefore something like this:
// 1#( language-range [ ";" "q" "=" qvalue ] )
// where:
// language-range = ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) | "*" )
// qvalue = ( "0" [ "." 0*3DIGIT ] )
// | ( "1" [ "." 0*3("0") ] )
preg_match_all("/([[:alpha:]]{1,8})(-([[:alpha:]|-]{1,8}))?" .
"(\s*;\s*q\s*=\s*(1\.0{0,3}|0\.\d{0,3}))?\s*(,|$)/i",
$http_accept_language, $hits, PREG_SET_ORDER);
// default language (in case of no hits) is the first in the array
$bestlang = $available_languages[0];
$bestqval = 0;
foreach ($hits as $arr) {
// read data from the array of this hit
$langprefix = strtolower ($arr[1]);
if (!empty($arr[3])) {
$langrange = strtolower ($arr[3]);
$language = $langprefix . "-" . $langrange;
}
else $language = $langprefix;
$qvalue = 1.0;
if (!empty($arr[5])) $qvalue = floatval($arr[5]);
// find q-maximal language
if (in_array($language,$available_languages) && ($qvalue > $bestqval)) {
$bestlang = $language;
$bestqval = $qvalue;
}
// if no direct hit, try the prefix only but decrease q-value by 10% (as http_negotiate_language does)
else if (in_array($langprefix,$available_languages) && (($qvalue*0.9) > $bestqval)) {
$bestlang = $langprefix;
$bestqval = $qvalue*0.9;
}
}
return $bestlang;
}
?>