Which Could Service do you recommend to purchase, so I can use it to learn how it works, how to change configuration of this cloud, install php there etc.?
I need this to be cheap and have an usual cloud environment, so if my client has a cloud from other provider I will be able to maintain it as well.
Since you'll be running PHP, why not choose the Zend platform on Amazon.
Sure, please check this services also Bitnami, Phpfog or CloudWays. They will allow you to play on multiple cloud environments with mulitple apps.
What Can Be Better Than WINDOWS AZURE. This is at the lowest price & includes super configuartions for PHP.
PHP is now officially supported as a language for developing applications that can run on Windows Azure, Microsoft's cloud operating system