[Andre02]

Try this:

PHP код:

if(strcmp("/open police", cmdtext, true, 10) == 0)
{
    if(GetPlayerSkin(playerid)!=280) return SendClientMessage(playerid, COLOR_ERROR,"You are not a cop");
    if(IsPlayerInRangeOfPoint(playerid, 3.0, 1151.2433,-1226.3589,17.2747));
    {
        MoveDynamicObject(copgate, 1151.3508, -1222.7382, 9.6951, 3);
        SendClientMessage(playerid, COLOR_BLUE, "Gate: Opened.");
    }
    else
    {
         SendClientMessage(playerid, COLOR_RED, "You are not near the gate.");
    }
    return 1;
} 


And read this: https://sampwiki.blast.hk/wiki/Control_Structures#else
and this: https://sampwiki.blast.hk/wiki/Control_Structures#else_if