Someone

orward Float:GetDistanceBetweenPlayers(playerid,giveplayerid);

public Float:GetDistanceBetweenPlayers(playerid,giveplayerid)
{
	new Float:x1,Float:y1,Float:z1,Float:x2,Float:y2,Float:z2;
	if (!IsPlayerConnected(playerid) || !IsPlayerConnected(giveplayerid)){
	return -1.00;
	}
	GetPlayerPos(playerid,x1,y1,z1);
	GetPlayerPos(giveplayerid,x2,y2,z2);
	return floatsqroot(floatpower(floatabs(floatsub(x2,x1)),2)+floatpower(floatabs(floatsub(y2,y1)),2)+floatpower(floatabs(floatsub(z2,z1)),2));
}