สอบถามเรื่อง การ generate QR Code แล้วเก็บข้อมูลลง database ค่ะ

<?PHP
include "phpqrcode/qrlib.php"; 
$fa_link = $_POST['fa_link']; //รหัสสินค้า
$PNG_TEMP_DIR = dirname(__FILE__).DIRECTORY_SEPARATOR.'image'.DIRECTORY_SEPARATOR; //กำหนด Path Temp
$PNG_WEB_DIR = 'image/'; //กำหนด Path รูป Qr Code
$filename = "";
$errorCorrectionLevel = 'L'; 
$matrixPointSize = 4; //ขนาด QR Code
$filename = $PNG_TEMP_DIR.$fa_link.'.png'; //ไฟล์
QRcode::png($fa_link, $filename, $errorCorrectionLevel, $matrixPointSize, 2);
?>

include "phpqrcode/qrlib.php"; 

$prod_id = $_POST['fa_link']; //รหัสสินค้า
$PNG_TEMP_DIR = dirname(__FILE__).DIRECTORY_SEPARATOR.'image'.DIRECTORY_SEPARATOR; //กำหนด Path Temp
$PNG_WEB_DIR = 'image/'; //กำหนด Path รูป Qr Code
$filename = "";
$errorCorrectionLevel = 'L'; 
$matrixPointSize = 5; //ขนาด QR Code
$filename = $PNG_TEMP_DIR.$prod_id.'.png'; //ไฟล์
QRcode::png($prod_id,$filename, $errorCorrectionLevel, $matrixPointSize, 2);

include "phpqrcode/qrlib.php"; 

    $tempDir = dirname(__FILE__).DIRECTORY_SEPARATOR.'image/QRCode'.DIRECTORY_SEPARATOR; 
    $codeContents = $_POST['fa_link']; 
    $fileName =  '005_file_'.md5($codeContents).'.png'; 
    $pngAbsoluteFilePath = $tempDir.$fileName; 
    if (!file_exists($pngAbsoluteFilePath)) { 
        QRcode::png($codeContents, $pngAbsoluteFilePath); 
        echo 'File generated!'; 
        echo '<hr />'; 
    } else { 
        echo 'File already generated! We can use this cached file to speed up site on common codes!'; 
        echo '<hr />'; 
    } 
     
    echo 'Server PNG File: '.$pngAbsoluteFilePath; 
    echo '<hr />';