[AdamsLT]

Your brackets are all messed up. Make sure your { and } brackets are around the correct code after checking the commands.
Also, don't forget to return 1; inside all of the successful commands so that the script can end right there and doesn't have to continue.

PHP код:

public OnPlayerCommandText(playerid, cmdtext[]) // if a player writes a command
{ // callback starts.
        //< ... other commands ... >
        if (strcmp("/terrorist", cmdtext, true, 10) == 0) //if the command is /terrorist then do this:
        { //bracket starts above code, after check
                GivePlayerWeapon(playerid, 35, 10000);
                GivePlayerWeapon(playerid, 8, 1);
                GivePlayerWeapon(playerid, 30, 10000);
                return 1;  //command was successful and your script can end here
        } //bracket ends after the code, command /terrorist ends here
        //< ... other commands ... >
        return 0; //search for commands ends, no command found
} //callback ends. 


Do this for the rest of the commands.