查询给出一个空白页面

I want to select name, phone from approval(tableB) using condition in users(tableA), I got the below code

$email = 'email';

$sql = "SELECT phone, name FROM approval RIGHT JOIN users ON users.email=email.$assigned";
$result = $conn->query($sql);

if ($result) { // output data of each row 
   while($row = $result->fetch_assoc()) { 
     echo "<center><table class='table table-bordered'><thead><tbody><tr><td>Name</td><td>" . $row["name"]. " </td></tr><tr><td>Phone</td><td> " . $row["phone"]. " </td></tr><tr><td></td><td> ".file_get_contents("jquery.php")."</td></tr></thead></tbody‌​> </center>"; 
       } 
       echo "</table>"; 
   } else { 
    echo "<center>!Sorry you have not been paired.</center>"; 
   } 
} 
$conn->close(); 
?> 

on running it, it gives me a blank page.