How to fill items on player inventory?

How to add/fill items on all slots of an players inventory? Merry Christmas btw

 

BUMP

 

Calculate the empty slots of a player then use for() and addItem()

Merry Christmas

 

PHP:

$player->getInventory()->addItem(Item::get(<id>, <damage>, <number>));

 

It would be nice if you read the question first

 

Ah yes I read wrong it seems to me that this is functional

PHP:

$player->getInventory->setItem($slot, Item::get(Item::STAINED_GLASS_PANE, 15, 1)->setCustomName("§cBarrier"), true);