Returning a PHP Array from a PHP SoapServer

Question

I'm relatively new to Soap on the "creating the service side", so appologies in advance for any terminology I'm munging.

Is it possible to return a PHP array from a Remote Procedure Soap Service that's been setup using PHP's SoapServer Class?

I have a WSDL (built by blindly following a tutorial) that, in part, looks something like this

<message name='genericString'>
    <part name='Result' type='xsd:string'/>
</message>

<message name='genericObject'>
    <part name='Result' type='xsd:object'/>
</message>

<portType name='FtaPortType'>       
    <operation name='query'>
        <input message='tns:genericString'/>
        <output message='tns:genericObject'/>
    </operation>        
</portType>

The PHP method I'm calling is named query, and looks something like this

public function query($arg){
    $object = new stdClass();
    $object->testing = $arg;
    return $object;     
}

This allows me to call

$client = new SoapClient("http://example.com/my.wsdl");
$result = $client->query('This is a test');

and dump of result will look something like

object(stdClass)[2]
    public 'result' => string 'This is a test' (length=18)

I want to return a native PHP array/collection from my query method. If I change my query method to return an array

public function query($arg) {
    $object = array('test','again');
    return $object;
}

It's serialized into an object on the client side.

object(stdClass)[2]
    public 'item' => 
        array
            0 => string 'test' (length=4)
            1 => string 'again' (length=5)

This makes sense, as I've specific a xsd:object as the Result type in my WSDL. I'd like to, if possible, return an native PHP array that's not wrapped in an Object. My instincts say there's a specific xsd:type that will let me accomplish this, but I don't know. I'd also settle for the object being serialized as an ArrayObject.

Don't hold back on schooling me in the technical details os WSDL. I'm trying to get a grasp on the underlying concepts fo

Answer 1

I used this WSDL generator to create description file.

Returning array of strings is something what my web service does, here's part of WSDL:

<wsdl:types>
<xsd:schema targetNamespace="http://schema.example.com">
  <xsd:complexType name="stringArray">
    <xsd:complexContent>
      <xsd:restriction base="SOAP-ENC:Array">
        <xsd:attribute ref="SOAP-ENC:arrayType" wsdl:arrayType="xsd:string[]" />
      </xsd:restriction>
    </xsd:complexContent>
  </xsd:complexType>
</xsd:schema>

</wsdl:types>
<message name="notifyRequest">
  <part name="parameters" type="xsd:string" />
</message>
<message name="notifyResponse">
  <part name="notifyReturn" type="tns:stringArray" />
</message>

Then API function notify is defined:

<wsdl:operation name="notify">
  <wsdl:input message="tns:notifyRequest" />
  <wsdl:output message="tns:notifyResponse" />
</wsdl:operation>