請(qǐng)問(wèn)token驗(yàn)證失敗是哪里的問(wèn)題

代碼如下：

$timestamp = $_GET['timestamp'];

$nonce ? ? = $_GET['nonce'];

$token ? ? = 'xiexie';

$signature = $_GET['signature'];

$array ? ? = ();

$array ? ? = $array($timestamp,$nonce,$token);

sort($array);

$tmpstr ? ?= implode('',$array);

$tmpstr ? ?= sha1($tmpstr);

if($tmpstr == $signature){

echo $_GET['echostr'];

exit;

}