One command, one file, LoadEntrances.

#define FILTERSCRIPT
#include <a_samp>

/*
One command, one file, an easy way to do entrances/exits.
A Tutorial and FilterScript by Jack Leslie.

Credits:
Tutorial on SA-MP Forums: Jack Leslie
Coding: Jack Leslie, apart from the split stock.
        I, Jack Leslie, did not code all of the
        coding involved in the use of the
        LoadEntrances, I however did some if it.

        The person who did the original coding of
        it is unknown, so I cannot give credits
        to that person.

        If you do know who it is, please tell me
        on the SA-MP forums so I can add credit
        onto the tutorial post.

The idea for "/door": dowster from SA-MP forums.
*/



//============================================================================//
stock split(const strsrc[], strdest[][], delimiter)
{
    new i, li;
    new aNum;
    new len;
    while(i <= strlen(strsrc)){
        if(strsrc[i]==delimiter || i==strlen(strsrc)){
            len = strmid(strdest[aNum], strsrc, li, i, 128);
            strdest[aNum][len] = 0;
            li = i+1;
            aNum++;
        }
        i++;
    }
    return 1;
}
//============================================================================//
enum entrancestats { outside_icon , Float:outside_x , Float:outside_y , Float:outside_z , Float:outside_a , outside_i , outside_w , inside_icon , Float:inside_x , Float:inside_y , Float:inside_z , Float:inside_a , inside_i , inside_w , opens , closes }
new Entrances[100][entrancestats];
new EntranceRef[sizeof(Entrances)][2];
//============================================================================//
stock LoadEntrances()
{
    new File:file = fopen("entrances.cfg",io_read);
    if(file)
    {
        new
            line[512],
            parts[16][32],
            commentpos = -1,
            count
        ;
        for(new i = 0;i < sizeof(Entrances);i++)
        {
            if(EntranceRef[i][0]) DestroyPickup(EntranceRef[i][0]);
            if(EntranceRef[i][1]) DestroyPickup(EntranceRef[i][1]);
            Entrances[i][outside_icon] = 0;
            Entrances[i][outside_x] = 0;
            Entrances[i][outside_y] = 0;
            Entrances[i][outside_z] = 0;
            Entrances[i][outside_a] = 0;
            Entrances[i][outside_i] = 0;
            Entrances[i][outside_w] = 0;
            Entrances[i][inside_icon] = 0;
            Entrances[i][inside_x] = 0;
            Entrances[i][inside_y] = 0;
            Entrances[i][inside_z] = 0;
            Entrances[i][inside_a] = 0;
            Entrances[i][inside_i] = 0;
            Entrances[i][inside_w] = 0;
        }
        while(fread(file,line) && count < sizeof(Entrances))
        {
            commentpos = strfind(line,"//",true);

            if(commentpos != 0)
            {
                if(commentpos != -1) strmid(line,line,0,commentpos);
                split(line,parts,',');
                Entrances[count][outside_icon] = strval(parts[0]);
                Entrances[count][outside_x] = floatstr(parts[1]);
                Entrances[count][outside_y] = floatstr(parts[2]);
                Entrances[count][outside_z] = floatstr(parts[3]);
                Entrances[count][outside_a] = floatstr(parts[4]);
                Entrances[count][outside_i] = strval(parts[5]);
                Entrances[count][outside_w] = strval(parts[6]);
                Entrances[count][inside_icon] = strval(parts[7]);
                Entrances[count][inside_x] = floatstr(parts[8]);
                Entrances[count][inside_y] = floatstr(parts[9]);
                Entrances[count][inside_z] = floatstr(parts[10]);
                Entrances[count][inside_a] = floatstr(parts[11]);
                Entrances[count][inside_i] = strval(parts[12]);
                Entrances[count][inside_w] = strval(parts[13]);
                EntranceRef[count][0] = CreatePickup(
                    Entrances[count][outside_icon],
                    23,
                    Entrances[count][outside_x],
                    Entrances[count][outside_y],
                    Entrances[count][outside_z],
                    Entrances[count][outside_w]
                );
                EntranceRef[count][1] = CreatePickup(
                    Entrances[count][inside_icon],
                    23,
                    Entrances[count][inside_x],
                    Entrances[count][inside_y],
                    Entrances[count][inside_z],
                    Entrances[count][inside_w]
                );
                count++;
            }
        }
        return 1;
    }
    return 0;
}
//============================================================================//

public OnFilterScriptInit()
{
    LoadEntrances();
    return 1;
}

public OnFilterScriptExit()
{
    return 1;
}

public OnPlayerCommandText(playerid, cmdtext[])
{
    if (strcmp(cmdtext, "/door", true) == 0)
    {
        for(new i = 0;i < sizeof(EntranceRef);i++)
        {
            if(
                IsPlayerInRangeOfPoint(playerid,2,Entrances[i][outside_x],Entrances[i][outside_y],Entrances[i][outside_z])
                &&
                GetPlayerVirtualWorld(playerid) == Entrances[i][outside_w]
                )
                    {
                        SetPlayerPos(playerid,Entrances[i][inside_x],Entrances[i][inside_y],Entrances[i][inside_z]);
                        SetPlayerFacingAngle(playerid,Entrances[i][inside_a]);
                        SetPlayerInterior(playerid,Entrances[i][inside_i]);
                        SetPlayerVirtualWorld(playerid,Entrances[i][inside_w]);
                        SetCameraBehindPlayer(playerid);
                        return 1;
                    }
                }
        for(new i = 0;i < sizeof(EntranceRef);i++)
                {
                    if(
                            IsPlayerInRangeOfPoint(playerid,2,Entrances[i][inside_x],Entrances[i][inside_y],Entrances[i][inside_z])
                            &&
                            GetPlayerVirtualWorld(playerid) == Entrances[i][inside_w]
                    )
                    {
                        SetPlayerPos(playerid,Entrances[i][outside_x],Entrances[i][outside_y],Entrances[i][outside_z]);
                        SetPlayerFacingAngle(playerid,Entrances[i][outside_a]);
                        SetPlayerInterior(playerid,Entrances[i][outside_i]);
                        SetPlayerVirtualWorld(playerid,Entrances[i][outside_w]);
                        return 1;
                    }
                }
        return 1;
    }
    if(strcmp(cmdtext, "/reloade", true) == 0)
    {
        if(IsPlayerAdmin(playerid))
        {
            LoadEntrances();
            SendClientMessage(playerid, -1, "Entrances reloaded!");
            return 1;
        }
    }
    return 0;
}

public OnPlayerPickUpPickup(playerid, pickupid)
{
    for(new i = 0;i < sizeof(EntranceRef);i++)
    {
        if(
            IsPlayerInRangeOfPoint(playerid,2,Entrances[i][outside_x],Entrances[i][outside_y],Entrances[i][outside_z])
            &&
            GetPlayerVirtualWorld(playerid) == Entrances[i][outside_w]
        )
        {
            GameTextForPlayer(playerid, "~w~Type ~r~/door~w~ to go inside", 5000, 5);
            return 1;
        }
    }
    for(new i = 0;i < sizeof(EntranceRef);i++)
    {
        if(
            IsPlayerInRangeOfPoint(playerid,2,Entrances[i][inside_x],Entrances[i][inside_y],Entrances[i][inside_z])
            &&
            GetPlayerVirtualWorld(playerid) == Entrances[i][inside_w]
        )
        {
            GameTextForPlayer(playerid, "~w~Type ~r~/door~w~ to go outside", 5000, 5);
            return 1;
        }
    }
    return 1;
}