[1.12] EntityPlayer vs EntityPlayerMP, checking if item in inventory

[TheGoldenProof]

I'm trying to check if an item is in a player's inventory using the onUpdate way I found here. I noticed it uses EntityPlayerMP, but in another place I saw EntityPlayer. What the difference and which should I use? Also if i should do the inventory checking differently tell me.

[V0idWa1k3r]

21 minutes ago, TheGoldenProof said:

EntityPlayerMP, but in another place I saw EntityPlayer. What the difference and which should I use?

EntityPlayerMP is the EntityPlayer of the logical server. EntityPlayer is a base class for players that other classes representing the player derive from. No player would actually be an instance of EntityPlayer. EntityPlayerSP is the player of the client for example.