PHP - Php Function Within A Mysql Select Statement.

//DATABASE CONNECTION VARIABLES
$myserver ="localhost";
$myname = "myname";
$mypassword = "mypassword";
$mydb ="mygamedb";


/*SQL CONNECTION*/
// Create connection
$conn = new mysqli($myserver, $myname, $mypassword, $mydb);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
else {

//variables
$username = $_POST["username"];
$password = $_POST["password"];
$ip = $_SERVER['REMOTE_ADDR'];

//INSERT USER
//prepare and bind
$stmt = $conn->prepare("INSERT INTO Players (Username, Password, IP) VALUES (?, ?, ?)");
//bind parameters
$stmt->bind_param("sss", $username, $password, $ip);
//set parameters and execute
$stmt->execute();
//close
$stmt->close();

//FETCH ID
$resultnews = mysql_query("SELECT * FROM Players WHERE Username ='$username'");
$rownews = mysql_fetch_array($resultnews);
$user_id = $rownews["ID"];


}

I need to convert the following select statement to a pdo->query but have no idea how to get it working:

SELECT t.id FROM 
  ( SELECT g.* 
    FROM location AS g
    WHERE g.start <=  16785408
    ORDER BY g.start DESC, g.end DESC
    LIMIT 1
  ) AS t
WHERE t.end >= 16785408;

Here's the code I'm trying:

<?php

$php_scripts = '../../php/';
require $php_scripts . 'PDO_Connection_Select.php';
require $php_scripts . 'GetUserIpAddr.php';
function mydloader($l_filename=NULL)

{
$ip = GetUserIpAddr();
if (!$pdo = PDOConnect("foxclone_data"))
{    
    exit;
}
    if( isset( $l_filename ) ) {  
        $ext = pathinfo($l_filename, PATHINFO_EXTENSION);
        $stmt = $pdo->prepare("INSERT INTO download (address, filename,ip_address) VALUES (?, ?, inet_aton('$ip'))");
        $stmt->execute([$ip, $ext]) ; 

        $test = $pdo->prepare("SELECT t.id FROM ( SELECT g.id FROM lookup AS g WHERE g.start <= inet_aton($ip) ORDER BY g.start DESC, g.end DESC ) AS  t  WHERE t.end >=inet_aton($ip)");
        $test ->execute() ; 
        $ref = $test->fetchColumn();
        $ref = intval($ref);

        $stmt = $pdo->prepare("UPDATE download SET ref = '$ref' WHERE address = '$ip'");
        $stmt->execute() ;         

        header('Content-Type: octet-stream');
        header("Content-Disposition: attachment; filename={$l_filename}");
        header('Pragma: no-cache');
        header('Expires: 0');        
        readfile($l_filename);
       }
        
    else {
        echo "isset failed";
        }  
}
mydloader($_GET["f"]);
exit;

 It gives the following error:

Fatal error: Uncaught PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '.144.181) ORDER BY g.start DESC, g.end DESC ) AS  t  WHERE t.end >=inet_aton(7' at line 1 in /home/foxclone/test.foxclone.com/download/mydloader.php:19 Stack trace: #0 /home/foxclone/test.foxclone.com/download/mydloader.php(19): PDO->prepare('SELECT t.id FRO...') #1 /home/foxclone/test.foxclone.com/download/mydloader.php(38): mydloader('foxclone40a_amd...') #2 {main} thrown in /home/foxclone/test.foxclone.com/download/mydloader.php on line 19

How do I fix this?

$Visit_data="SELECT WeekNo.WNo, WeekNo.WCom, Countries.Country, ctryvisits.CVisits FROM ctryvisits 
LEFT JOIN Countries
ON ctryvisits.country=Countries.CID
LEFT JOIN WeekNo
      ON ctryvisits.WNo=WeekNo.WNo
      WHERE Countries.Country = '".$_POST["Country"]."'
ORDER BY ctryvisits.WNo LIMIT '".$_POST["QUARTER"]."'" - 13, '".$_POST["QUARTER"]."'";