I want to develop a website (php) that can manage the documents. I want to integrate only the Alfresco functionality that manages the documents (I do not need other features like WCM and I dont need Share interface). Is there an existing solution?
There is a PHP SDK available that you can use to talk to the core Alfresco repo if you want to build your own user interface. Please note that this SDK is a community project, and is not officially supported by Alfresco. You can find some details of the project on the wiki here:
In addition, there is also a PHP version of the Apache Chemistry project, which would allow you to access the repo using the CMIS protocol. Information about that project is here:
So there are several mechanisms that you can use to access the Alfresco repository directly to do what you want. Please let me know if you have additional questions - I hope this helps!