Solved Block position help!

How do I get the block that's touching STILL_WATER block?
For instances, I wanna work on sugarcane generation, how do I get the block that's touching 'STILL_WATER'?

PHP:

$isRiverbank = false;
for($side = 2; $side <= 5; $side++){
  if($block->getSide($side)->getId() === Block::STILL_WATER){
    $isRiverbank = true;
    break;
  }
}

if($isRiverbank){
  ...
}