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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: How do I fix this?