Single admin user powers?

Hi Ravi,

I think this largely depends on how you frame the situation. If it's simply an integration between two systems then it's common practice to have an integration user in Salesforce to represent the remote system.

However, if the PHP application is more of a front end for Salesforce used by multiple users, who individually 'own' data records, then you should be using a licence per user, as all you're really doing is creating your own user authentication layer above the platform which is not allowed according to the T&Cs.

Update If the users own contacts as you say, then I'm afraid you're falling on the side of needed licences for each user. If they contacts are shared and visible to all, without being tied to particular users then you could just use the one licence, but it sounds like you'd still be toeing the line in this scenario.