This is a stripped down version of https://github.com/kreativekorp/barcode
Use from a PHP script:
include 'qrcode.php';
$generator = new QRCode($data, $options);
/* Output directly to standard output. */
$generator->output_image();
/* Create bitmap image. */
$image = $generator->render_image();
imagepng($image);
imagedestroy($image);
Use with GET or POST:
qrcode.php?s={symbology}&d={data}&{options}
e.g.
qrcode.php?s=qr&d=HELLO%20WORLD&sf=8&ms=r&md=0.8
s - Symbology (type of QR code). One of:
qr
qr-l
qr-m
qr-q
qr-h
d - Data. Encode in Shift-JIS for kanji mode.
w - Width of image. Overrides sf or sx.
h - Height of image. Overrides sf or sy.
sf - Scale factor. Default is 4.
sx - Horizontal scale factor. Overrides sf.
sy - Vertical scale factor. Overrides sf.
p - Padding. Default is 0.
pv - Top and bottom padding. Default is value of p.
ph - Left and right padding. Default is value of p.
pt - Top padding. Default is value of pv.
pl - Left padding. Default is value of ph.
pr - Right padding. Default is value of ph.
pb - Bottom padding. Default is value of pv.
bc - Background color in #RRGGBB format.
fc - Foreground color in #RRGGBB format.
md - Module density. A number between 0 and 1. Default is 1.
wq - Width of quiet area units. Default is 1. Use 0 to suppress quiet area.
wm - Width of narrow modules and spaces. Default is 1.