qrcoder_pop.php est un greffon pour Wordpress permettant de creer a la volee des qrcode pour les articles. Il les stock dans un dossier et ne l'est genere qu'a la premiere consultation. Ils sont places dans le sous-dossier wp-content/uploads/qrcodes/ de l'installation de Wordpress. Chaque icone est un PNG de 87x87 pixels de 280 à 350 octets chacuns.

Comment l'utiliser :

 * la variable qrencode doit contenir le chemin du binaire qrencode. Pour l'installer : (apt-get install|pacman -S|...) qrencode

qrcoder_pop.php is a Wordpress plugin that generate qrcode picture for each article. It create it in a hierarchical wordpress subfolder at the first blog display, so it doesn't need to generate all the picture each time. The pictures Ãare black and white PNG and take about 280~350 bytes 87x87 pixels PNG. They are placed in wp-content/uploads/qrcodes/ Wordpress sub-folder.
QRencode allow to make SVG, that are biger in sizes, but perfectly scalable, even with zoom using antialiasing (that is not interesting for QRcode).  I use this since november 2012 without problems.

Prerequis:
Install qrencode (LGPL) from FUKUCHI Kentaro : http://fukuchi.org/works/qrencode/
* Sources : tar xf qrencode-${version}.tar.gz; cd qrencode-${version; CFLAGS=-O3 ./configure --prefix=/usr && make && make install-strip
* Debian/ubuntu/... : apt-get install qrencode
* Arch/Antergos/... : pacman -S qrencode
* Redhat/Fedora/... : yum install qrencode


How to use it:
 * You must have qrencode.
 * qrencode var must contain the path of the qrencode binary.
 * call the php function in post header (in every page showing post) from your theme.
 * It<B4>s not neccessary to give any parameters!
 * It will verify if the qrcode already exists, and will create it only at the first acces of a post (from you blog visitors), will take no time to generate (tested for 10 posts on a singlecore 1,8Ghz celeron) mutualized server.
 * qrcode for article 12345 will be placed in 12/345.png so the directory will not grow too much, with posts revision not all numbers will be used so file part should be little than 999.
 * qrcode