How to calculate YAW and PITCH from Vector3

please how can i calculate YAW and PITCH from Vector3 or Vector3 from yaw and pitch?

You can't.
To get Yaw, $player->getYaw()
To get pitch, $player->getPitch()
replace $player with your player object or entity object

no.. I want to face player at specific Vector3, or Get Vector3 where is player faced

Vector3 only contains X, Y, Z

just because i don´t know how to find it out.

e.g. I want to make rotating NPC, Their Pitch and Yaw will update depending player position.

You can take a look at how my Zombies (from Mobsters does this):

https://github.com/alejandroliu/bad...c/aliuly/mobsters/idiots/Zombie.php#L209-L212

Nobody ever told you XYZ can only represent coordinates. It can also represent three-dimensional factors.

https://github.com/PocketMine/PocketMine-MP/blob/master/src/pocketmine/entity/Entity.php#L869

THX! i must learn math functions better.