[MsgtHill]

Alright, figured it out.
Correct way:

Код:

forward Float:GetHealth(playerid);
public Float:GetHealth(playerid)
{
	new Float:x;
	GetPlayerHealth(playerid, x);
	return x;
}

The reason for this, correct me if I'm wrong, is that functions which return a tag, such as a float, need to be forwarded and tagged.