//判断编码是否为utf-8
function is_utf8($string) {
if (preg_match ( "/^([" . chr ( 228 ) . "-" . chr ( 233 ) . "]{1}[" . chr ( 128 ) . "-" . chr ( 191 ) . "]{1}[" . chr ( 128 ) . "-" . chr ( 191 ) . "]{1}){1}/", $string ) == true || preg_match ( "/([" . chr ( 228 ) . "-" . chr ( 233 ) . "]{1}[" . chr (
128 ) . "-" . chr ( 191 ) . "]{1}[" . chr ( 128 ) . "-" . chr ( 191 ) . "]{1}){1}$/", $string ) == true || preg_match ( "/([" . chr ( 228 ) . "-" . chr ( 233 ) . "]{1}[" . chr ( 128 ) . "-" . chr ( 191 ) . "]{1}[" . chr ( 128 ) . "-" . chr ( 191 ) . "]{1}){2,}/",
$string ) == true) {
return true;
} else {
return false;
}
}