not sure on a specific method, but you could do a simple strpos() test with a chinese character as the needle, i think it would be wise to choose a very common chinese character to maximise the chance of the check working...
$check = strpos($infofromdb,"‰ä");
if ($check == 0){
//if check = 0 then english be the language
} else {
//check holds the postition of the character so its in chinese
}
There probably is a better way