[Tee]

pawn Код:

stock GetDistanceBetweenPlayers(playerid,playerid2)
{
    new Float:x1,Float:y1,Float:z1,Float:x2,Float:y2,Float:z2;
    new Float:tmpdis;
    GetPlayerPos(playerid,x1,y1,z1);
    GetPlayerPos(playerid2,x2,y2,z2);
    tmpdis = floatsqroot(floatpower(floatabs(floatsub(x2,x1)),2)+floatpower(floatabs(floatsub(y2,y1)),2)+floatpower(floatabs(floatsub(z2,z1)),2));
    return floatround(tmpdis);
}

Example:

pawn Код:

if(GetDistanceBetweenPlayers(playerid ,id) > 2.0)return SendClientMessage(playerid,Grey,"You are to far from that player");

I did not make this, all credit goes to whoever made it.