Solved Checking corner block

Hello everyone!

I just create a function to check that block is in corner or not (true false).
I was tried a method with checking (X + 1), (X - 1), (Z + 1), (Z - 1), but its not accurate, maybe my algorithm did it wrongly.

this is my algo:

PHP:

public function isCorner(Block $b) : bool
  {
    $x = (int) $b->getX();
    $y = (int) $b->getY();
    $z = (int) $b->getZ();
    $l = $b->getLevel();
    var_dump($x);
    var_dump($y);
    var_dump($z);
    $id = $b->getId();
    if ($l->getBlockIdAt($x + 1, $y, $z) == $id && $l->getBlockIdAt($x - 1, $y, $z) !== $id) {
      echo "if ke 1\n";
      if ($l->getBlockIdAt($x, $y, $z + 1) == $id && $l->getBlockIdAt($x, $y, $z - 1) !== $id) {
        return true;
      } elseif ($l->getBlockIdAt($x, $y, $z - 1) == $id && $l->getBlockIdAt($x, $y, $z + 1) !== $id) {
        return true;
      } else {
        return false;
      }
    } elseif ($l->getBlockIdAt($x - 1, $y, $z) == $id && $l->getBlockIdAt($x + 1, $y, $z) !== $id) {
      echo "if ke 2\n";
      if ($l->getBlockIdAt($x, $y, $z + 1) == $id && $l->getBlockIdAt($x, $y, $z - 1) !== $id) {
        return true;
      } elseif ($l->getBlockIdAt($x, $y, $z - 1) == $id && $l->getBlockIdAt($x, $y, $z + 1) !== $id) {
        return true;
      } else {
        return false;
      }
    } else {
      echo "if ke 3\n";
      return false;
    }
  }


when i debugging, all if are called (if ke 1, if ke 2, if ke 3) but always return to false.
then i try other way, i use Block::getSide(); but im not sure if it can really works with.

so please, tell me about Block::getSide() what is first parameter and second parameter for? or tell me what should i change from my code to get more accurate calculation.

 

EDITED:

okay i got it.

PHP:

   const SIDE_DOWN = 0;
   const SIDE_UP = 1;
   const SIDE_NORTH = 2;
   const SIDE_SOUTH = 3;
   const SIDE_WEST = 4;
   const SIDE_EAST = 5;


so i need someone to explain where is my fault on my own function?