ถามเกี่ยวกับ Soap : PHP ช่วยดูให้หน่อยครับ มันส่งค่ามาไม่ได้

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//---> service.php
require 'products.class.php';
function getAllCategory($conditionCate){
	$product = new Products();
	$acate = $product->show_category('*',$conditionCate=null);
	return $acate;  // array()
}

//---> service.wsdl
<?xml version ='1.0' encoding ='UTF-8' ?>
<definitions name='StockQuote'
  targetNamespace='http://example.org/StockQuote'
  xmlns:tns=' http://example.org/StockQuote '
  xmlns:soap='http://schemas.xmlsoap.org/wsdl/soap/'
  xmlns:xsd='http://www.w3.org/2001/XMLSchema'
  xmlns:soapenc='http://schemas.xmlsoap.org/soap/encoding/'
  xmlns:wsdl='http://schemas.xmlsoap.org/wsdl/'
  xmlns='http://schemas.xmlsoap.org/wsdl/'>
    
<message name='allCategoryReques'>
    <part name='conditionCate' type='xsd:string'/>
</message>
<message name='allCategoryResponse'>
    <part name='ResultAllCate' type="xsd:string"/>
</message>

<portType name='productsPortType'>
  <operation name='getAllCategory'>
    <input message='tns:allCategoryReques'/>
    <output message='tns:allCategoryResponse'/>
  </operation>
</portType> 

<binding name='productsBinding' type='tns:productsPortType'>
  <soap:binding style='rpc'
    transport='http://schemas.xmlsoap.org/soap/http'/>
  <operation name='getAllCategory'>
    <soap:operation soapAction='urn:xmethods-delayed-quotes#getAllCategory'/>
    <input>
      <soap:body use='encoded' namespace='urn:xmethods-delayed-quotes' encodingStyle='http://schemas.xmlsoap.org/soap/encoding/'/>
    </input>
    <output>
      <soap:body use='encoded' namespace='urn:xmethods-delayed-quotes' encodingStyle='http://schemas.xmlsoap.org/soap/encoding/'/>
    </output>
  </operation>
</binding>

<service name='priceService'>
    <port name='productsPort' binding='productsBinding'>
    <soap:address location='http://127.0.0.1/k-station/includes/price/service.php'/>
</port>
</service>
</definitions>

//---> test_conn.php
	$soap_client = new SoapClient( "http://127.0.0.1/k-station/includes/price/service.wsdl",array("trace" => 1, "exceptions" => 0));
	// ,array("trace" => 1, "exceptions" => 0)
	$test = $soap_client->getAllCategory('5');
	var_dump($soap_client->__getFunctions());
	echo  '<br/>--------------------------<br/>';
	print "Request : ".htmlspecialchars($soap_client->__getLastRequest()) ;
	echo  '<br/>--------------------------<br/>';
 	print "Response : ".htmlspecialchars($soap_client->__getLastResponse());
	
	/*
	foreach ($test as $a) {
		print_r($a);
		echo $i++;
	}
	*/
//---> ผลลัพธ์จาการรัน
array(1) { [0]=> string(44) "string getAllCategory(string $conditionCate)" }
--------------------------
Request : <?xml version="1.0" encoding="UTF-8"?> <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="urn:xmethods-delayed-quotes" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:getAllCategory><conditionCate xsi:type="xsd:string">5</conditionCate></ns1:getAllCategory></SOAP-ENV:Body></SOAP-ENV:Envelope>
--------------------------
Response :