No Elemnt Arrays and Complex DataType

Hello. I have a datatype lie this:
$server->wsdl->addComplexType(
        'Airport',
        'complexType',
        'struct',
        'all',
        '',
        array(
                'code' => array('name'=>'code','type'=>'xsd:string'),
                'description' => 
array('name'=>'description','type'=>'xsd:string')
        )
);

And other one that is like this:

$server->wsdl->addComplexType(
        'AirportArray',
        'complexType',
        'array',
        '',
        'SOAP-ENC:Array',
        array(),
        array(
                
array('ref'=>'SOAP-ENC:arrayType','wsdl:arrayType'=>'tns:Airport[]')
        ),
        'tns:Airport'
);


They work really good, but i need now to pass a response when there is no 
aviable data. So i need a zero element array. i make it this way:

$airports = array();
return $ariports;

but it still seems to have one element...
How must i pass a zero element array and how must i check it on the client 
side??
thanks


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