multiple validation for single field

I have 3 fields 'account_name','billable_option' and 'billable_option_yes' 'billable_option' is required if 'billable_option_yes' is not filled and 'billable_option_yes' is required if 'billable_option' is not filled

and I want to check both field is not required if 'account_name' value is 0 I want to combine the validation required_unless:account_name,0

if($account!=0){ } not working



$account=$request->account_name;        
     if($account!=0){ //not working
                $this->validate($request,[
                'billable_option' => 'required_without:billable_option_yes',
                'billable_option_yes' =>'required_without:billable_option',
                ],$messages); 
    }
   $messages=[
            'billable_option.required_without'=>'The Billable is Required',
            'billable_option_yes.required_without'=>'The Billable optoion is Required',
       ];
      $this->validate($request,[
        ...
       'billable'=>'required_unless:account_name,0', //fourth field working fine
        ..
      ],$messages);

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