PHP检测用户语言的方法

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function getPreferredLanguage() {

$langs = array();

if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {

// break up string into pieces (languages and q factors)

preg_match_all('/([a-z]{1,8}(-[a-z]{1,8})?)\s*(;\s*q\s*=\s*(1|0\.[0-9]+))?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'], $lang_parse);

if (count($lang_parse[1])) {

// create a list like "en" => 0.8

$langs = array_combine($lang_parse[1], $lang_parse[4]);

// set default to 1 for any without q factor

foreach ($langs as $lang => $val) {

if ($val === '') $langs[$lang] = 1;

}

// sort list based on value

arsort($langs, SORT_NUMERIC);

}

}

//extract most important (first)

foreach ($langs as $lang => $val) { break; }

//if complex language simplify it

if (stristr($lang,"-")) {$tmp = explode("-",$lang); $lang = $tmp[0]; }

return $lang;

}