Max Function & sql display the highest number field data from mysql database

Display the highest number data from MySql Database

<?php
//protected area orig3 file
$query = "SELECT MAX(ttravelid) FROM travelid";
$resultx = mysql_query($query) or die(mysql_error());
while($row = mysql_fetch_array($resultx))
{
//echo "The most highest reservation id is ".$row['MAX(reservationid)'];
$ttravelid1 = $row['MAX(ttravelid)'];
//echo $ttraveliddd;
}
//this is the max number
echo $ttravelid1;

?>

or you can use sql, this will display the highest id number of the personal data.

<?php
$con = mysql_connect("localhost","root");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}

mysql_select_db("my_db", $con);

$result = mysql_query("SELECT * FROM person order by id DESC limit 1");

echo "<table border='1'>
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>";
while($row = mysql_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row['FirstName'] . "</td>";
echo "<td>" . $row['LastName'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysql_close($con);
?>