[Nero_3D]

It isn't complicated, they just used a flag to see if the gate is opened or closed and executed the right code

pawn Код:

if(strcmp(cmdtext, "/gate", true) == 0) {
    static // local static variables hold their value after the function finished
        bool: gateOpened = false
    ;
    if(gateOpened) {
        // if its opened execute the closing code
        gateOpened = false;
    } else {
        // if it isn't opend execute the opening code
        gateOpened = true;
    }
}