This code used to live at http://lebonmail.com which has now been blocked by http://leboncoin.fr
It enabled users to receive email notifications as soon as a new ad corresponding to their search was published.
Install this code on any php compatible web host to use it for yourself
Set a cron job to run every ten minutes (or whichever update inerval you choose) to call the /all_searches URL with wget or curl
For example :
*/10 * * * * wget http://lebonmail.local/all_searches