How to I create custom item?

Hello, how to I create a custom item? And how to I set texture it?

 

I don't think that's possible to create new item. However you can change texture of existing item using resource packs.

 

PHP:

#The id of the item to create
$id = 700;
$name = "New Item Name";
#If you want to override a item set to true
#Do it on the OnEnable() or where you want
ItemFactory::registerItem(new Item($id,0,$name), false);
#To see that item in the inventory creative
Item::addCreativeItem(Item::get($id));

 

This doesnt show texture on it

 

But it adds a new item (without special texture)?