[Littlehelper]

Use variables to detect that.
EX:

pawn Код:

new IsPlayerOnWork[MAX_PLAYERS];
// OnPlayerConnect 
IsPlayerOnWork[playerid] = 0;
// OnDisconnect
IsPlayerOnWork[playerid] = 0;
// On Command /Work
if(!strcmp("/work",cmdtext))
    {
    if(IsPlayerOnWork[playerid] == 1)
    {
        IsPlayerOnWork[playerid] = 0;
        SendClientMessage(playerid,-1,"You Are Now Off Duty!");
        SetPlayerSkin(playerid, 277);
    else
    {
        IsPlayerOnWork[playerid] = 1;
        // More Code Of Yours
        return 1;
    }