表单正则验证及文件上传验证功能

 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！‘; }