OnPlayerTargetPlayer

#include <a_samp>
forward OnPlayerTargetPlayer(playerid,newtarget,oldtarget);

new target[MAX_PLAYERS] = {INVALID_PLAYER_ID,...};

forward OPTP_OnPlayerUpdate(playerid);
forward OPTP_OnPlayerConnect(playerid);

public OnPlayerUpdate(playerid)
{
    new trg = GetPlayerTargetPlayer(playerid);
    if(funcidx("OnPlayerTargetPlayer") != -1) CallLocalFunction("OnPlayerTargetPlayer","iii",playerid,trg,target[playerid]);
    target[playerid] = trg;
    OPTP_OnPlayerUpdate(playerid);
    return 1;
}
#if defined _ALS_OnPlayerUpdate
    #undef OnPlayerUpdate
#else
    #define _ALS_OnPlayerUpdate
#endif
#define OnPlayerUpdate OPTP_OnPlayerUpdate

public OnPlayerConnect(playerid)
{
    target[playerid] = INVALID_PLAYER_ID;
    OPTP_OnPlayerConnect(playerid);
}
#if defined _ALS_OnPlayerConnect
    #undef OnPlayerConnect
#else
    #define _ALS_OnPlayerConnect
#endif
#define OnPlayerConnect OPTP_OnPlayerConnect