Problems with sendblocks

I have this code:

PHP:

     $sndblks = [];
       foreach($blocks as $i=>$block){
         list($x,$y,$z)=array_map("intval", explode(".", $i));
         $sndblks[] = Block::get($block->getId(),$block->getDamage(),
                         new Position($x,$y,$z,$l));
       }
       $l->sendBlocks($l->getChunkPlayers($pl->getX()>>4,$pl->getZ()>>4),
                 $sndblks, UpdateBlockPacket::FLAG_ALL_PRIORITY);


Sometimes it works, sometimes it doesn't. Anybody can spot the problem? This is intended to run on PocketMine 1.5.

Full code is here: https://github.com/alejandroliu/bad-plugins/blob/master/ToyBox/src/aliuly/toybox/MagicCarpet.php#L68

What about using ":" instead of "."?

That worked.

I am actually surprised that it was the problem.

I was thinking if there may be some, like, `.0` or even non-rounded things.