PHP function to determine whether a string is English or Chinese

static function ischinese($s){
 $allen = preg_match("/^[^/x80-/xff]+ $/", $s); //Determine whether it is English
 $allcn = preg_match("/^[".chr(0xa1)."-".chr(0xff)."]+$/",$s) ; //Determine whether it is Chinese
 if($allen){
 return 'allen';
 }else{
 if($allcn){
 return 'allcn';
 }else{
 return 'encn';
 }
 }
 }
?> //by bbs.it-home.org