In PHP to check non-equality (without checking type) you can do this:

if( A != B ) {
    DO SOMETHING;
}

But you can also do this, which has the same result:

if( A <> B ) {
    DO SOMETHING;
}

Is there any difference?

Does using != over <> change the evaluation in any way, shape, or form?

What is the difference between <% %> and <%= %> in ASP.NET MVC? And when to use which?

What is the difference between += and =+? Specifically, in java, but in general also.

I have been looking at and playing with the FusedLocationProviderApi. That class contains these two methods:

PendingResult<Status> requestLocationUpdates(GoogleApiClient client, LocationRequest request, LocationCallback callback, Looper looper)

PendingResult<Status> requestLocationUpdates(GoogleApiClient client, LocationRequest request, LocationListener listener, Looper looper)

They have very similar signatures and descriptions with the only difference being that one uses LocationCallback and the other uses LocationListener.

The abstract class LocationCallback defines two methods:

void onLocationAvailability(LocationAvailability locationAvailability)

void onLocationResult(LocationResult result)

and the interface LocationListener defines just one method

abstract void onLocationChanged(Location location)

Disregarding the additional method in LocationCallback, what is the difference between these two? Is there some conceptual difference or special use case that makes one preferable over the other? What is the rationale in duplicating the functionality?

I have been going through some jQuery functionality.

Can any one please give me some idea of what the difference is between the use of $ and $$?