PHP Code:
register_clcmd( "amx_knife","giveweapon");
register_concmd("amx_knife", "ConCmd_BlockBuy", ADMIN_MAP);
register_clcmd( "amx_knife", "ClientCommand_Knife",ADMIN|SILVER|GOLDEN, "- start knife round" );
I think it could be a problem to register same command with 3 different handlers, depending on what you return in them.
Make only 1 callback.
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