My new directory site be hacked after I finished install . what is reason? ---------------------------------------------------------- I noticed that hacker ever visited that new directory.He did not visited others site. And I find all sites in that hosts were all hacked.Only homepages be changed.
Yes, we do try to respond rapidly if someone reports a hacker. The way you describe the problem makes me think the server where you have the directory hosted has been compromised, so the problem is probably the server, not the directory script (whether that be phpLD or otherwise).
Definitely sounds like your host has been compromised. This is a common problem with small (and cheap/free) hosting companies...I'm assuming this is the situation for you. I strongly suggest you move to a more well-known and established hosting company. Their security will be much tighter.
"Potentially" not deleting the install folder could be a risk. In other words if you are getting the install still writable message, that would mean you did not properly install phpLD.
Block your URL and have an expert take a look at it most probably would be your developer. The more quickly you solve the problem, the more beneficial it would be for you.