Library

locale()

locale returns the preferred language extracted from the HTTP request header Accept-Language.

The function returns the ISO 639 language code with the highest quality value. If the header is not present, locale returns false.

locale is used by the dispatch function to determine the language when it is not specified in the URL.

If Accept-Language: fr-FR,fr;q=0.9,en;q=0.8 is found in the header, locale returns fr.

function locale() {
if (empty($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
return false;
}
$httplanguages = $_SERVER['HTTP_ACCEPT_LANGUAGE'];
$lang = false;
$quality = 0.0;
$accepted = preg_split('/,\s*/', $httplanguages);
foreach ($accepted as $accept) {
$match = null;
$result = preg_match('/^([a-z]{1,8}(?:[-_][a-z]{1,8})*)(?:;\s*q=(0(?:\.[0-9]{1,3})?|1(?:\.0{1,3})?))?$/i', $accept, $match);
if ($result < 1) {
continue;
}
$q = isset($match[2]) ? (float)$match[2] : 1.0;
if ($q > $quality) {
$quality = $q;
$lang = strtok($match[1], '-_');
if ($quality == 1.0) {
break;
}
}
}
return $lang;
}

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