PHP - Strange Problem With Soap.only First Declareted Operation In Bindings Works Fine

I have strange problem with SOAP. My file SchoolAPI look like that:


<?php
require_once('../require/constants.php');
require_once('../require/connection.inc.php');
 
class SchoolAPI{

private $dbh;

   

public function __construct()
    {
 

 

$this->dbh = new PDO(DRIVER.':host='.HOST.';dbname='.DB, USER, PASSWORD);
  

}
  

//function return all subcjects

public function getSubjects(){

$sth = $this->dbh->prepare('  SELECT id, nazwa ROM subjects');

$sth->execute(); 

 

return $sth->fetchAll(PDO::FETCH_NUM); 

//return array(array("1", "subject1"),array("2", "subject2"));

}

//function return all classes

public function getClasses(){

$sth = $this->dbh->prepare('  SELECT id, nazwa FROM classes');

$sth->execute();  
 

return $sth->fetchAll(PDO::FETCH_NUM);

//return array(array("1", "class1"),array("2", "class2"));

}
  
}
ini_set("soap.wsdl_cache_enabled", "0");
$server = new SoapServer("SchoolAPI.wsdl");
$server->setClass("SchoolAPI");
$server->handle();
?>


wsdl file is named SchoolAPI.wsdl and look like that:


<wsdl:definitions  

xmlns="http://schemas.xmlsoap.org/wsdl/" 

xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" 

xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" 

xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" 

xmlns:xsd="http://www.w3.org/2001/XMLSchema" 

xmlns:tns="http://schema.example.com" 

targetNamespace="http://schema.example.com" >
  
  <wsdl:types>
  

<xsd:schema targetNamespace="http://schema.example.com">

<xsd:complexType name="myarry2">

<xsd:sequence>

<xsd:element minOccurs="0" maxOccurs="unbounded" name="row" nillable="true" type="xsd:string" /> 

</xsd:sequence>

</xsd:complexType>

</xsd:schema>
    <xsd:schema targetNamespace="http://schema.example.com">

<xsd:complexType name="myarray">

<xsd:sequence>

<xsd:element minOccurs="0" maxOccurs="unbounded" name="table" nillable="true" type="tns:myarry2" /> 

</xsd:sequence>

</xsd:complexType>

</xsd:schema>
  </wsdl:types>

  <wsdl:message name="getSubjectsRequest"></wsdl:message>
  <wsdl:message name="getSubjectsResponse">
    <part name="getSubjectsReturn" type="tns:myarray"/>
  </wsdl:message>

  <wsdl:message name="getClassesRequest"></wsdl:message>
  <wsdl:message name="getClassesResponse">
    <part name="getClassesReturn" type="tns:myarray"/>
  </wsdl:message>

  <wsdl:portType name="SchoolAPIPortType">
    <wsdl:operation name="getSubjects">
      <wsdl:input message="tns:getSubjectsRequest"/>
      <wsdl:output message="tns:getSubjectsResponse"/>
    </wsdl:operation>

    <wsdl:operation name="getClasses">
      <wsdl:input message="tns:getClassesRequest"/>
      <wsdl:output message="tns:getClassesResponse"/>
    </wsdl:operation>
  </wsdl:portType>

  <wsdl:binding name="SchoolAPIBinding" type="tns:SchoolAPIPortType">
    <soap:binding transport="http://schemas.xmlsoap.org/soap/http"/>
    <wsdl:operation name="getSubjects">
      <soap:operation soapAction="urn:SchoolAPI/getSubjects" style="document"/>
      <wsdl:input> <soap:body use="literal"/></wsdl:input>
      <wsdl:output><soap:body use="literal"/></wsdl:output>
    </wsdl:operation>
    <wsdl:operation name="getClasses">
      <soap:operation soapAction="urn:SchoolAPI/getClasses" style="document"/>
      <wsdl:input> <soap:body use="literal"/></wsdl:input>
      <wsdl:output><soap:body use="literal"/></wsdl:output>
    </wsdl:operation>
  </wsdl:binding>
  
  <wsdl:service name="SchoolAPI">
    <wsdl:port name="SchoolAPIPort" binding="tns:SchoolAPIBinding">
      <soap:address location="http://localhost:82/myschool/webservices/SchoolAPI.php" />
    </wsdl:port>
  </wsdl:service>
</wsdl:definitions>


The problem is that correct data is returned olny by first function declarated in <wsdl:binding> section. In this example correct data will be return by getSubjects function, and function getClassses return null. However, if we change order and put getClasses operation first in binding section like this:


  <wsdl:binding name="SchoolAPIBinding" type="tns:SchoolAPIPortType">
    <soap:binding transport="http://schemas.xmlsoap.org/soap/http"/>

 <wsdl:operation name="getClasses">
      <soap:operation soapAction="urn:SchoolAPI/getClasses" style="document"/>
      <wsdl:input> <soap:body use="literal"/></wsdl:input>
      <wsdl:output><soap:body use="literal"/></wsdl:output>
    </wsdl:operation>
    <wsdl:operation name="getSubjects">
      <soap:operation soapAction="urn:SchoolAPI/getSubjects" style="document"/>
      <wsdl:input> <soap:body use="literal"/></wsdl:input>
      <wsdl:output><soap:body use="literal"/></wsdl:output>
    </wsdl:operation>
  </wsdl:binding>


then correct data will be return by getClasses function, and getSubjects will return null. Do you know what is going on? I do my best to solve this problem and I have no idea what is wrong...