new GlobalVarForObject[MAX_PLAYERS]; // this is a global variable to store object's ID

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(newkeys & CTRL_KEY_HERE) // you've gotta change it by yourself
    {
        DestroyObject(GlobalVarForObject[playerid]); // if there's still an object we delete it
        GlobalVarForObject[playerid] = CreateObject(/*object params...*/); // replace by object param, just like modelid and coordinates
        SetTimerEx("DestroyRamp", TIME_HERE, false, "i", playerid); // TIME_HERE has to be replaced by the time of the ramp in milliseconds
    }
    return 1;
}

forward DestroyRamp(playerid);
public DestroyRamp(playerid) // this callback destroy our ramp
{
    DestroyObject(GlobalVarForObject[playerid]); // we destroy the ramp created by the x playerid
    return 1;
}

#if defined _ramp_included
#endinput
#endif

#define _ramp_included
#pragma library ramp


static Pressedkey[MAX_PLAYERS] = {false, ...};
new jumped[MAX_PLAYERS] = {-1, ...};
static ramped[MAX_PLAYERS];
static noramp[MAX_PLAYERS];
forward Keys();
forward DeleteRamp(playerid);
forward RampCommandText(playerid, cmdtext[]);

public RampCommandText(playerid, cmdtext[]){
    if (strcmp("/ramphelp ", cmdtext, true, 9) == 0)	{
		SendClientMessage(playerid, COLOUR_GOOD, "Type /rampon to turn ramp spawning on.");
        SendClientMessage(playerid, COLOUR_GOOD, "Type /rampoff to turn ramp spawning off.");
        SendClientMessage(playerid, COLOUR_GOOD, "Press the [Fire] button whilst in a vehicle to spawn a ramp.");

        return 1;
	}
	if (strcmp("/rampoff ", cmdtext, true, 8) == 0)	{
		ramped[playerid] = 1;
		noramp[playerid] = 1;
		SendClientMessage(playerid, COLOUR_BAD, "Type /rampon to turn it back on!");
		return 1;
	}
	if (strcmp("/rampon ", cmdtext, true, 7) == 0)	{
		ramped[playerid] = 0;
		noramp[playerid] = 0;
		SendClientMessage(playerid, COLOUR_BAD, "Type /rampoff to turn it back off!");
		return 1;
	}
    return 0;
}

public Keys(){
	new keys, jump, updown, playerid;
	new Float:x, Float:y, Float:z, Float:angle;
	for (playerid = 0; playerid < MAX_PLAYERS; playerid++) {
	    if (IsPlayerConnected(playerid)) {
			GetPlayerKeys(playerid, keys, jump, updown);
			if(ramped[playerid] == 1 && noramp[playerid] == 1)	{
			if(keys & KEY_FIRE && IsCarRampable(playerid))	{
                        SendClientMessage(playerid, COLOUR_BAD, "You have Ramping turned off!");
                        SendClientMessage(playerid, COLOUR_BAD, "Type /rampon to turn it back on!");
				}
			}
			else if(ramped[playerid] == 1)	{
			
			}
			else if (keys & KEY_FIRE && IsPlayerInCar(playerid)) {{
					    GetPlayerPos(playerid, x, y, z);
					    angle = GetPosInFrontOfPlayer(playerid, x, y, GetRampDistance(playerid));
					    jumped[playerid] = CreateObject(1632, x, y, z - 0.5, 0.0, 0.0, angle);
					    ramped[playerid] = 1;
					    SetTimerEx("DeleteRamp", 800, 0, "d", playerid);
				    }
			    }
			} else Pressedkey[playerid] = false;
		}
}

public DeleteRamp(playerid){
	if (jumped[playerid] != -1) {
	    DestroyObject(jumped[playerid]);
	    jumped[playerid] = -1;
	    ramped[playerid]=0;
	}
}

#endinput

SetTimer("Keys", 100, 1);

new gcmd;
gcmd += RampCommandText(playerid, cmdtext);
if(gcmd >= 1) return 1;