Difference between [square brackets] and *asterisk

If you write a C++ function like

void readEmStar( int *arrayOfInt )
{
}

vs a C++ function like:

void readEmSquare( int arrayOfInt[] )
{
}

What is the difference between using [square brackets] vs *asterisk, and does anyone have a style guide as to which is preferrable, assuming they are equivalent to the compiler?

For completeness, an example

void readEmStar( int *arrayOfInt, int len )
{
  for( int i = 0 ; i < len; i++ )
    printf( "%d ", arrayOfInt[i] ) ;
  puts("");
}


void readEmSquare( int arrayOfInt[], int len )
{
  for( int i = 0 ; i < len; i++ )
    printf( "%d ", arrayOfInt[i] ) ;
  puts("");
}

int main()
{
  int r[] = { 2, 5, 8, 0, 22, 5 } ;

  readEmStar( r, 6 ) ;
  readEmSquare( r, 6 ) ;
}