Gets the actor ID of the closest <actor> within <distance> into a <gamevar>. If no actor within range is found, the gamevar is set to -1. The input for <actor> may be its tile number (example: 2000) or its defined name (example: PIGCOP). The <distance> will be determined on the x and y plane only; for finding actors on the x, y, and z axes use findnearactor3d instead.
Also note that if the <actor> being located within the <distance> is asleep this will return a value of -1
Also see findnearsprite.