Someone

new ownedcar[MAX_PLAYERS];

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ownedcar[playerid] = dUserINT(PlayerName(playerid)).("car");

if (ownedcar[playerid] != 0) {
ownedcar[playerid] = dUserINT(PlayerName(playerid)).("car");
}

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   if (strcmp(cmdtext, "/purchase", true)==0) // to set the vehicle that you register to be teleported
{

    if (GetPlayerMoney(playerid) < 5000)
    {
SendClientMessage(playerid,COLOR_YELLOW,"[PURCHASE]: Sorry, you don't have enough money to buy a car.");
}
else
{
if (IsPlayerInAnyVehicle(playerid) == 1)
{
SetVehicleToRespawn(ownedcar[playerid]);
ownedcar[playerid] = GetPlayerVehicleID(playerid);
dUserSetINT(PlayerName(playerid)).("car",ownedcar[playerid]);
owner[ownedcar[playerid]] = playerid;
SendClientMessage(playerid,COLOR_YELLOW,"[PURCHASE]: Congragulations! You have purchased a new car.");
GivePlayerMoney(playerid,-5000);
}
else
{
            SendClientMessage(playerid,COLOR_YELLOW,"[PURCHASE]:  Please get in a vehicle to buy it.");
}
}
return 1;
}


if (strcmp(cmdtext, "/callcar", true)==0)
{
    if (ownedcar[playerid] != 0)
    {
          if (GetPlayerMoney(playerid) < 500)
    {
SendClientMessage(playerid,COLOR_YELLOW,"[CAR]: Sorry, you don't have enough money to use the car teleport service.");
}
else
{
        new Float:playerpos[4];
    GetPlayerPos(playerid,playerpos[0],playerpos[1],playerpos[2]);
    GetPlayerFacingAngle(playerid,playerpos[3]);
    SetVehicleZAngle(ownedcar[playerid],playerpos[3]+90.0);
    SetVehiclePos(ownedcar[playerid],playerpos[0]+3.0*floatsin(-playerpos[3],degrees),playerpos[1]+3.0*floatcos(-playerpos[3],degrees),playerpos[2]+0.5); // This one is cool that I am using trigo functions to set the vehicle just before you.
    SendClientMessage(playerid,COLOR_YELLOW,"[CAR]: Thank you for using car teleport service. Your car has came.");
    GivePlayerMoney(playerid,-500);
}
    }
return 1;
}