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HomeBackend DevelopmentPHP Tutorial php数据库有关问题,

php数据库问题,求助。。。。
初学PHP来的,想自己写一个登陆的页面,但现在连验证帐号都过不去,请大家看下我的代码是哪里有问题 

<?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>"; <br />
} <br />
<br />
echo $_POST["user"]; <br />
$dba = $db->affected_rows; <br />
echo $dba; <br />
mysqli_close($db); <br />
?> 

$result = $db->query($query) or die("Error in the consult.." . mysqli_error($db)); 
这句不加后面的错误显示的话后面的 echo $dba 显示的是-1,但是我输入的帐号在数据库里面是有的。 
我输入的user123是 vvvvy 
但是网页打开来提交后显示这个错误 Error in the consult..You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''user' WHERE 'user_email' = 'vvvvy'' at line 1 

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