header("Content-type:text/html;charset=utf-8");
 $user = isset($_POST[‘user‘])?$_POST[‘user‘]:null;
 $password = isset($_POST[‘password‘])?$_POST[‘password‘]:null;
 $arr = array(‘png‘,‘gif‘,‘jpg‘);
 $uploads = move_uploaded_file($_FILES[‘face‘][‘tmp_name‘],‘uploads/‘.$_FILES[‘face‘][‘name‘]);
 $file = ‘uploads/‘.$_FILES[‘face‘][‘name‘];
 if($uploads){
   echo ‘上传成功‘;
 }
 if(!preg_match("/^[\x{4e00}-\x{9fa5}]+$/u", $user)){
   //正则检查用户名是否为全汉字组成
   echo "用户名只能由纯汉字组成！";
   die;
 }else if(!preg_match("/^[\x{4e00}-\x{9fa5}A-Za-z0-9_]+$/u",$password)){
   //正则检查密码是否含有非法字符
   echo ‘密码不能包含特殊字符！‘;
   die;
 }else if(!in_array(pathinfo($file, PATHINFO_EXTENSION),$arr)){
   echo "文件格式不正确";
   die;
 }else{
   echo ‘允许注册！‘;
 }