PHP code example of technicalguru / qrcode

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

technicalguru / qrcode example snippets

$text = 'This is an example QR code';
$file = __DIR__.'/example-qr.png';

\QR\QRcode::png($text, $file, QR_ECLEVEL_L, 8);

echo 'QR code saved at '.$file;

t it to writable location, a place for temp generated PNG file
$PNG_TEMP_DIR = dirname(__FILE__).DIRECTORY_SEPARATOR.'qrcodes'.DIRECTORY_SEPARATOR;

// html PNG location prefix
$PNG_WEB_DIR = 'qrcodes/';

// of course 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';
    \QR\QRcode::png($_REQUEST['data'], $filename, $errorCorrectionLevel, $matrixPointSize, 2);

} else {

    // default data
    echo 'You can provide data in GET parameter: <a href="?data=like_that">like that</a><hr/>';
    \QR\QRcode::png('PHP QR Code :)', $filename, $errorCorrectionLevel, $matrixPointSize, 2);

}

// display generated file
echo '<img src="'.$PNG_WEB_DIR.basename($filename).'" /><hr/>';

// config form
echo '<form method="post">
    Data:&nbsp;<input name="data" value="'.(isset($_REQUEST['data'])?htmlspecialchars($_REQUEST['data']):'PHP QR Code :)').'" />&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="GENERATE"></form><hr/>';