$str = "2222编程";
if (preg_match("/[\x{4e00}-\x{9fa5}]+/u",$str)) {
print("该字符串全部是中文");
} else {
print("该字符串不全部是中文");
}
$str = "2222编程";
if (preg_match("/[\x{4e00}-\x{9fa5}]+/u",$str)) {
print("该字符串全部是中文");
} else {
print("该字符串不全部是中文");
}