ArmorSpawn New Api

Hello today is the second topic that I would like to ask how do I set armor to all players that spawn
$ player = $ this-> GetServer () -> getPlayer
tell me how please let inmpostare armor to all players who enter the server for the first time

PHP:

$player = blah blah blah;
$player->getInventory()->setBoots(Item::get(Item::DIAMOND_BOOTS));

sorry but I wish all players a player not defined

The problem is, how often do you do that? For example, you have to do that when a player respawns.

The best is do that on player join and player respawn.

when the player respauna just a sign that premerra and armor will then throw the code that I'm missing and what all the players for the first time entering the server can have default armor