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I'm using the following code for users to download files from my website. It works fine for files under 50MB, but fails immediately for larger files. Can someone explain why this is happening and how to fix it? Some of the downloadable files are over 800MB, so I need this working. NOTE: No error messages are thrown on large files. <?php error_reporting(E_ALL); ini_set('display_errors', '1'); $php_scripts = '../../php/'; require $php_scripts . 'PDO_Connection_Select.php'; require $php_scripts . 'GetUserIpAddr.php'; $ip = GetUserIpAddr(); if (!$pdo = PDOConnect("foxclone_data")) { echo "unable to connect"; exit; } function mydloader($l_filename=NULL){ if( isset( $l_filename ) ) { $filename = preg_replace("/\s+/u", " ", $l_filename); $ext = pathinfo($filename, PATHINFO_EXTENSION); if ($ext == '.deb') header('Content-Type: octet-stream'); elseif ($ext == '.iso') header('Content-Type: application/x-cd-image'); elseif ($ext =='.gz') header('Content-Type: application/zip'); else header('Content-Type: octet-stream'); header('Content-Description: File Transfer'); header("Content-Disposition: attachment; filename={$filename}"); header('Pragma: public'); header('Expires: 0'); header('Cache-Control: must-revalidate'); header('Pragma: public'); header('Content-Length: ' . filesize($filename)); readfile($filename); // Get lookup id $test = $pdo->query("SELECT lookup.id FROM lookup WHERE inet_aton('$ip') >= lookup.ipstart AND inet_aton('$ip') <= lookup.ipend"); $ref = $test->fetchColumn(); $ref = intval($ref); // Insert record in download table $stmt = $pdo->prepare("INSERT INTO download (`address`, `filename`, `ip_address`, `lookup_id`) VALUES (?, ?, inet_aton('$ip'),?)"); $stmt->execute([$ip, $ext, $ref]) ; } else { echo "isset failed"; } } mydloader($_GET["f"]); Thanks in advance