how to update entitys?

Hello.

I need help updating the entity-position.

I tried:

PHP:

$entity-> setPosition (new Vector3 ($x, $y, $z));
$entity-> update (); //Doesnt work
$entity-> updatePosition (); //Also doesnt work
$entity-> updateLast (); //Again doesnt work


I looked into the source, but this was the only things i found.
I hope someone can help me.

Thanks.