php数据库有关问题，

<?php <br />$user123 = $_POST['user']; <br />$db = new mysqli($sqln,$sqlu,$sqlp,$sqld) or die("Error in the consult.." . mysqli_error($db)); <br />$query = "SELECT 'user_email' FROM 'user' WHERE 'user_email' = '$user123'"; <br />// mysql_select_db($sqld); <br />mysqli_select_db($db, $sqld); <br />$result = $db->query($query) or die("Error in the consult.." . mysqli_error($db)); <br />if ($result == 1){ <br />echo "<p> 登陆成功 </p>"; <br />} <br />elseif ($result == 0){ <br />echo "<p> 没有找到 </p>
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                            <a href="/xiazai/code/11190">NT80 购物系统</a>
                            <p>功能说明：1 会员可申请开店功能2 购买在线扣除金额3 冲值卡自动生成4 支持2级分类5 数据库压缩和备份6 会员分5个级别7 商品带讨论8 自带融合论坛，可关闭打开9 密码找回功能10 新闻``滚动新闻``帮助中心11 后台设置前台会员的上传权限12 可关闭/打开商店13 会员自助发布商品功能14 用户问题咨询管理</p>
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                            <span>查看详情</span>
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                "; <br />} <br /><br />echo $_POST["user"]; <br />$dba = $db->affected_rows; <br />echo $dba; <br />mysqli_close($db); <br />?>