pocketmine\level\format\FullChunk::setBlock PHP Method

    public function setBlock($x, $y, $z, $blockId = null, $meta = null);

 protected function parsePreset($preset, $chunkX, $chunkZ)
 {
     $this->preset = $preset;
     $preset = explode(";", $preset);
     $version = (int) $preset[0];
     $blocks = isset($preset[1]) ? $preset[1] : "";
     $biome = isset($preset[2]) ? $preset[2] : 1;
     $options = isset($preset[3]) ? $preset[3] : "";
     preg_match_all('#^(([0-9]*x|)([0-9]{1,3})(|:[0-9]{0,2}))$#m', str_replace(",", "\n", $blocks), $matches);
     $y = 0;
     $this->structure = [];
     $this->chunks = [];
     foreach ($matches[3] as $i => $b) {
         $b = Item::fromString($b . $matches[4][$i]);
         $cnt = $matches[2][$i] === "" ? 1 : intval($matches[2][$i]);
         for ($cY = $y, $y += $cnt; $cY < $y; ++$cY) {
             $this->structure[$cY] = [$b->getId(), $b->getDamage()];
         }
     }
     $this->floorLevel = $y;
     for (; $y < 0xff; ++$y) {
         $this->structure[$y] = [0, 0];
     }
     $this->chunk = clone $this->level->getChunk($chunkX, $chunkZ);
     $this->chunk->setGenerated();
     $c = Biome::getBiome($biome)->getColor();
     $R = $c >> 16;
     $G = $c >> 8 & 0xff;
     $B = $c & 0xff;
     for ($Z = 0; $Z < 16; ++$Z) {
         for ($X = 0; $X < 16; ++$X) {
             $this->chunk->setBiomeId($X, $Z, $biome);
             $this->chunk->setBiomeColor($X, $Z, $R, $G, $B);
             for ($y = 0; $y < 128; ++$y) {
                 $this->chunk->setBlock($X, $y, $Z, ...$this->structure[$y]);
             }
         }
     }
     preg_match_all('#(([0-9a-z_]{1,})\\(?([0-9a-z_ =:]{0,})\\)?),?#', $options, $matches);
     foreach ($matches[2] as $i => $option) {
         $params = true;
         if ($matches[3][$i] !== "") {
             $params = [];
             $p = explode(" ", $matches[3][$i]);
             foreach ($p as $k) {
                 $k = explode("=", $k);
                 if (isset($k[1])) {
                     $params[$k[0]] = $k[1];
                 }
             }
         }
         $this->options[$option] = $params;
     }
 }