//set it to writable location, a place for temp generated PNG files
$PNG_TEMP_DIR = dirname(__FILE__).DIRECTORY_SEPARATOR.'temp'.DIRECTORY_SEPARATOR;

//html PNG location prefix
$PNG_WEB_DIR = 'temp/';
include "qrlib.php";


//ofcourse we need rights to create temp dir
if (!file_exists($PNG_TEMP_DIR))
    mkdir($PNG_TEMP_DIR);


$filename = $PNG_TEMP_DIR.'test.png';

//processing form input
//remember to sanitize user input in real-life solution !!!
$errorCorrectionLevel = 'L';
if (isset($_REQUEST['level']) && in_array($_REQUEST['level'], array('L','M','Q','H')))
    $errorCorrectionLevel = $_REQUEST['level'];
$matrixPointSize = 4;
if (isset($_REQUEST['size']))
    $matrixPointSize = min(max((int)$_REQUEST['size'], 1), 10);
if (isset($_REQUEST['data'])) {

    //it's very important!
    if (trim($_REQUEST['data']) == '')
        die('data cannot be empty! <a href="?">back</a>');

    // user data
    $filename = $PNG_TEMP_DIR.'test'.md5($_REQUEST['data'].'|'.$errorCorrectionLevel.'|'.$matrixPointSize).'.png';
    QRcode::png($_REQUEST['data'], $filename, $errorCorrectionLevel, $matrixPointSize, 2);

} else {

    //default data

    QRcode::png(' QR Code :)', $filename, $errorCorrectionLevel, $matrixPointSize, 2);

}

//display generated file


//config form
echo '<form action="index.php" method="post">

    Link:&nbsp;<input name="data" value="'.(isset($_REQUEST['data'])?htmlspecialchars($_REQUEST['data']):'введите ссылку на сайт').'" />&nbsp;
    ECC:&nbsp;<select name="level">
        <option value="L"'.(($errorCorrectionLevel=='L')?' selected':'').'>L - smallest</option>
        <option value="M"'.(($errorCorrectionLevel=='M')?' selected':'').'>M</option>
        <option value="Q"'.(($errorCorrectionLevel=='Q')?' selected':'').'>Q</option>
        <option value="H"'.(($errorCorrectionLevel=='H')?' selected':'').'>H - best</option>
    </select>&nbsp;
    Size:&nbsp;<select name="size">';

for($i=1;$i<=10;$i++)
    echo '<option value="'.$i.'"'.(($matrixPointSize==$i)?' selected':'').'>'.$i.'</option>';
echo '</select>&nbsp;
    <input type="submit" value="Генерировать"></form><hr/>';

/* benchmark
QRtools::timeBenchmark(); */   `