请问一个查询数据库输出后进行判断的有关问题

<br />
<?php<br />
<br />
$mysql_server_name='localhost';<br />
$mysql_username='root';<br />
$mysql_password='123456';<br />
$mysql_database='you';<br />
<br />
$conn = mysql_connect($mysql_server_name,$mysql_username,$mysql_password);<br />
<br />
mysql_select_db($mysql_database,$conn);<br />
<br />
mysql_query("set names 'utf8'");<br />
<br />
$sql = "SELECT * FROM `member` WHERE username LIKE 'xiha'";<br />
<br />
$result = mysql_query($sql,$conn);<br />
<br />
$row = mysql_fetch_array($result);<br />
<br />
mysql_close($conn); <br />
<br />
if($row['groupid'] = '1'){<br />
        $capacity = '100';<br />
} else if($row['groupid'] = '10'){<br />
        $capacity = '1000';<br />
} else {<br />
        exit();<br />
}<br />
<br />
echo $capacity;<br />
<br />
?><br />