[gtakillerIV]

PHP код:

public OnPlayerCommandText(playerid, cmdtext[]) { 
     dcmd(ban, 3, cmdtext); 
     return 0; 
} 


You should "return 1" instead of "return 0".

And that's not how you use Dcmd.

No need to add "dcmd(ban, 3, cmdtext);" cause it won't even work.