can anybody make better this code?

Hi everyone

Here my PHP code .. its looking so bad,but work :s

i have 2 table with the both row is same

//PHP retrive data 
<?
$id = isset($_POST['id']) ? (int)$_POST['id'] : 0;

if($id > 0)
{
    //Query the DB
    $db1 = mysql_query("SELECT * FROM table1 WHERE uid = " . $id);
    $db2 = mysql_query("SELECT * FROM table2 WHERE uid = " . $id);
    
    if($db1 === false && $db2 === false)
    {
        die("Database Error");
    }
    
  

         echo " <center><b>Get UID '$id' </b></center><br>";
    while ($row = mysql_fetch_assoc($db1)){
        echo "UID :{$row['uid']}  <br> ".
             "Username : {$row['username']} <br> ".
             "Phone : {$row['phone']} <br> ".
             "Email : {$row['acct_email']} <br> ".
             "--------------------------------<br>";

    }
    while ($row = mysql_fetch_assoc($db2)){
        echo "UID :{$row['uid']} <br> ".
             "Username : {$row['username']} <br> ".
             "Phone : {$row['phone']} <br> ".
             "Email : {$row['acct_email']} <br>" .
             "--------------------------------<br>";
     }
     
}

?>
//php search
<?


$searchid = trim($_POST['name']);

//check whether the name parsed is empty
if($searchid == "")
{
	
        echo "<center><h2>Please input Serial ID or Searching by Name</h2></center>";
	exit();
}



$query = "SELECT * FROM table WHERE username LIKE '%$searchid%'";
$query2 = "SELECT * FROM table WHERE username LIKE '%$searchid%'";

$results = mysqli_query($link, $query);
$results2 = mysqli_query($link, $query2);


if(mysqli_num_rows($results) >= 1)
{
        echo " <center><b>Keyword '$searchid' is found </b></center><br><br>" ;	
        $output = "";
	while($row = mysqli_fetch_array($results))
	{

                 
        $output .= "User ID: " . $row['uid'] . "<br />";
	$output .= "Username :" . $row['username'] . "<br />";
	$output .= "phone: " . $row['phone'] . "<br />";
	$output .= "Email: " . $row['acct_email'] . "<br /><br />";
        $output .= "--------------------------------<br>";
	}


	

}
if(mysqli_num_rows($results2) >= 1)
{
        	
        $output2 = "";
	while($row = mysqli_fetch_array($results2))
	{

                $output2 .= "User ID: " . $row['uid'] . "<br />";
		$output2 .= "Username :" . $row['username'] . "<br />";
		$output2 .= "Phone: " . $row['phone']. "<br />";
		$output2 .= "Email: " . $row['acct_email'] . "<br />";
                $output2 .= "--------------------------------<br>";

    }

       echo "$output $output2";
       
}

can anyone make this code more structure?

?