php的问题，这是个有关登录的，好尴尬，dalao们，帮帮忙

Question

<?php
$con = mysql_connect("localhost","root","123456");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("my_db", $con);
$username = $_POST['用户名'];
$passowrd = $_POST['密码'];
if ($username && $passowrd){
$sql = "select * from person where 用户名 = '$username' and 密码='$passowrd'";
$result = mysql_query($sql);
$rows=mysql_num_rows($result);
if($rows){header("biao-shuchu.html");
exit;
}else{
echo "用户名或密码错误";

   }

}else{
echo "表单填写不完整";

}

mysql_close($con);
?>
说我$username = $_POST['用户名'];
$passowrd = $_POST['密码'];
有问题，我才学的，该怎么改

Answer 1

$username不需要引号。书读得少，第一次看到用中文的属性列和属性值，最好还是改为英文。$_POST['username']