[Dark_Kostas]

It didnt work. But you gave me the idea to try it with Public.

pawn Код:

forward Float:PlayerDistanceToPoint(playerid,Float:x,Float:y,Float:z);
public Float:PlayerDistanceToPoint(playerid,Float:x,Float:y,Float:z)
{
  new Float:px,Float:py,Float:pz;
  GetPlayerPos(playerid,px,py,pz);
    return floatsqroot ( ( (x-px)*(x-px) ) + ( (y-py)*(y-py) ) + ( (z-pz)*(z-pz) ) );
}

This is working. Problem SOLVED.