I see everywhere for downgrade php on wampserver I just have to do left click wamp> php>version> get more> And dowload the version I want.
But when I do it I arrive on this page and I don't see any link for download an other php version. I only can download a file php5.2.4.isson this page
So fine I dowload it on php.net and I unzip the archive in my folder "C:\wamp\bin\php\php5.2.4"
Next I copy the files wampserver.conf, php.ini and phpForApache.ini from my folder "C:\wamp\bin\php\php5.5.12" to the folder "C:\wamp\bin\php\php5.2.4"
And to finish I change in the file php.ini and phpForApache.ini the path :
extension_dir = "C:\wamp\bin\php\php5.2.4"
When I restart wamp I have the 2 versions of php the one I use actualy (5.5.12) and the one I want to instal (5.2.4) but when I choose the 5.2.4 my wamp icon became orange and stay like this I don't understand why.