php创建token

function create_token() {
$randLength = 6;
$chars = 'abcdefghijklmnopqrstuvwxyz';
$len = strlen($chars);
$randStr = '';
for ($i = 0; $i < $randLength; $i++) {
$randStr.=$chars[rand(0, $len - 1)];
}
$token = $randStr . time();

return $token;
}