protected void doRemoveAll(int index, int len) {
		for (int i=index+len-1; i>=index; i--) {
			doRemove(i);
		}
	}
Remove specified range of elements from list.

@param index index of first element to remove
@param len   number of elements to remove
jphp-runtime/src/php/runtime/memory/support/IList.java