PHP如果URL仅包含某个参数

Question

I understand I can use the following to see if the parameter p exists in the URL. However this will also work if there is also a q, t, r etc parameter

if(isset($_GET['p'])) {}

I also know that the following sees if there is any parameter set

if(count($_GET)) {}

However what i need is:

If ONLY parameter p exists -> do something... else if parameter p exists and any other parameter exists else do something... else if parameter != p , or no parameter exists - do something else

Any tips would be much appreciated

Answer 1

if(isset($_GET['p']) && count($_GET['p']) == 1){
//do something
} else if (isset($_GET['p'])){
//do something
} else {
//do something else
}