First Person [sa-mp]

new Float:ZOOM[MAX_PLAYERS];
new po[MAX_PLAYERS];
public OnPlayerConnect(playerid) {
po[playerid]=-1;
ZOOM[playerid]=-0.6;
return 1;}
public OnFilterScriptInit(){
for(new i=0; i < MAX_PLAYERS; i++)
if(IsPlayerConnected(i) && !IsPlayerNPC(i)) po[i]=-1;
return 1;}
public OnFilterScriptExit() {
for(new i=0; i < MAX_PLAYERS; i++)
if(IsPlayerConnected(i) && !IsPlayerNPC(i) && po[i]!=-1) DestroyObject(po[i]);
return 1;}
public OnPlayerKeyStateChange(playerid, newkeys, oldkeys){
if(newkeys==8192&&po[playerid]!=-1&&ZOOM[playerid]+0.1!=0){ ZOOM[playerid]+=0.1; AttachObjectToPlayer(po[playerid], playerid, 0.0,ZOOM[playerid],0.0,0.0,0.0,0.0); SetCameraBehindPlayer(playerid);}
else if(newkeys==16384&&po[playerid]!=-1&&ZOOM[playerid]-0.1!=-1){ ZOOM[playerid]-=0.1; AttachObjectToPlayer(po[playerid], playerid, 0.0,ZOOM[playerid],0.0,0.0,0.0,0.0); SetCameraBehindPlayer(playerid);}
else if(newkeys == KEY_WALK&&po[playerid]==-1){
po[playerid]=CreateObject(1,0.0,0.0,0.0,0.0,0.0,0.0);
AttachObjectToPlayer(po[playerid], playerid, 0.0,ZOOM[playerid],0.0,0.0,0.0,0.0);}
else if(newkeys == KEY_WALK&&po[playerid]!=-1){
DestroyObject(po[playerid]); po[playerid]=-1;}
return 1;}