Description:
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It would be great to have a function which is just like current, with the 
difference that it advances the array pointer to the next element after reading 
the current value.

When using current() in a loop, you always have to call next(). Including a 
function that acts like current() while automatically advancing the array 
pointer would be more elegant.

It can be implemented in PHP userland like this:

function currentPlusOne($array) {

    $element = current($array);

    next($array);

    return $element;
}

A native implementation among current(), next() etc. would be ideal, of course.