```php
function getDefaultLanguage()
{
if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
return parseDefaultLanguage($_SERVER['HTTP_ACCEPT_LANGUAGE']);
} else {
return parseDefaultLanguage(null);
}
}
function parseDefaultLanguage($http_accept, $deflang = 'zh-TW')
{
if (isset($http_accept) && strlen($http_accept) > 1) {
# Split possible languages into array
$x = explode(',', $http_accept);
foreach ($x as $val) {
#check for q-value and create associative array. No q-value means 1 by rule
if (preg_match("/(.*);q=([0-1]{0,1}.\d{0,4})/i", $val, $matches)) {
$lang[$matches[1]] = (float) $matches[2];
} else {
$lang[$val] = 1.0;
}
}
#return default language (highest q-value)
$qval = 0.0;
foreach ($lang as $key => $value) {
if ($value > $qval) {
$qval = (float) $value;
$deflang = $key;
}
}
}
return strtolower($deflang);
}
echo getDefaultLanguage();
```
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