i develop an PHP Web App, where users can create and edit events inside.
Now i would like to sync these events with the iCloud Calendars from each user.
The PHP Web App should read,create and edit the events from the icloud calenders.
Is that possible?
I could realy find a API or Docomentation.
It would be important that i can make that happend without the use of Xcode.
If I understand what you're trying to do, the answer is "no". A user's iCloud calendars aren't accessible via a web API. If you have a native app, then your app could use EventKit to access the user's calendar data (after requesting/gaining permission from the user).
You can do this using icloud throughout caldav protocol.