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my wsdl file (catalog.wsdl):
<?xml version ='1.0' encoding ='UTF-8' ?>
<definitions name='Catalog'
  targetNamespace='http://localhost/catalog.wsdl'
  xmlns:tns='http://localhost/catalog.wsdl'
  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='getCatalogRequest'>
  <part name='catalogId' type='xsd:string'/>
</message>
<message name='getCatalogResponse'>
  <part name='Result' type='xsd:string'/>
</message>

<portType name='CatalogPortType'>
  <operation name='getCatalogEntry'>
    <input message='tns:getCatalogRequest'/>
    <output message='tns:getCatalogResponse'/>
  </operation>
</portType>

<binding name='CatalogBinding' type='tns:CatalogPortType'>
  <soap:binding style='rpc'
    transport='http://schemas.xmlsoap.org/soap/http'/>
  <operation name='getCatalogEntry'>
    <soap:operation soapAction='urn:localhost-catalog#getCatalogEntry'/>
    <input>
      <soap:body use='encoded' namespace='urn:localhost-catalog'
        encodingStyle='http://schemas.xmlsoap.org/soap/encoding/'/>
    </input>
    <output>
      <soap:body use='encoded' namespace='urn:localhost-catalog'
        encodingStyle='http://schemas.xmlsoap.org/soap/encoding/'/>
    </output>
  </operation>
</binding>

<service name='CatalogService'>
  <port name='CatalogPort' binding='CatalogBinding'>
    <soap:address location='http://localhost/soap-server.php'/>
  </port>
</service>
</definitions>

my soap-server.php file :
<?php
function getCatalogEntry($catalogId)
{
    if ($catalogId == 'catalog1')
    {
    $first = "n";
    return $first;
    }
    elseif ($catalogId == 'catalog2')
    {
    $second = "m";
    return $second;
    }
}
 ini_set("soap.wsdl_cache_enabled", "0");
    $server = new SoapServer("http://localhost/catalog.wsdl");
    $server->addfunction("getCatalogEntry");
    $server->handle();
?>


my soap-client.php file:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    <head>
        <title>simple SOAP test</title>
        <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
    </head>
    <body>

<?php

try {
echo "m";
    $client = new SoapClient('http://localhost/catalog.wsdl');
	  $catalogId = 'catalog1';
	  $response = $client->getCatalogEntry($catalogId);


} catch (SoapFault $fault) {

    echo "Error :".$fault->getMessage();


    }

 echo $response;
var_dump(var_dump);
?>

</body>
</html>