Usage of optional nusoap Parameters

From: http://hi.baidu.com/thinkinginlamp/blog/item/65fccbefe245dd32acafd5c6.html
We haven't figured out how to process the optional parameters in nusoap. Today, we found the solution is simple:

$ Nusoap-> WSDL-> addcomplextype (
'Foo ',
'Complextype ',
'Struct ',
'All ',
'',
Array (
'Bar' => array (
'Name' => 'bar ',
'Type' => 'xsd: string ',
'Minoccurs' => '0 ',
'Maxcomputings' => '1' // 'maxcomputings' => 'unbounded'
)
)
);

It is mainly used in combination with minoccurs and maxoccurs. When minoccurs is equal to 0, the parameter is optional. When maxoccurs is equal to 1, the parameter can only appear once at most. When maxoccurs is equal to unbounded, the parameter can appear multiple times.

By the way, apart from minoccurs and maxoccurs, there is also a nillable parameter that can be used. The optional values are true and false.