<?php
include('../lib/full/qrlib.php');
// text output
$codeContents = '12345';
// generating
$text = QRcode::text($codeContents);
$raw = join("<br/>", $text);
$raw = strtr($raw, array(
'0' => '<span style="color:white">██</span>',
'1' => '██'
));
// displaying
echo '<tt style="font-size:7px">'.$raw.'</tt>';