WSF/PHP data services - Out of memory (Apache crash)

Hello, I'm using WSF/PHP data services library to develop data services as SOAP. The service works well but the apache memory usage rise, as the soap client is called, until it crashes both apache and postgresql servers. Can someone please tell me about this issue. Thanks.   My server : <?php require_once("DataService.php"); // database configurations $db_config = array( "db" => "pgsql", "username" => "postgres", "password" => "postgres", "dbname" => "DBTICKETS", "dbhost" => "localhost" );   // security configuration $pub_key = ws_get_cert_from_file("./clientsoapovh9.crt"); $pvt_key = ws_get_key_from_file("./servsoapovh9.key"); $pub_key_server = ws_get_cert_from_file("./servsoapovh9.crt"); $sec_array = array("sign"=>TRUE,"encrypt" => TRUE, "algorithmSuite" => "Basic256Rsa15", "securityTokenReference" => "IssuerSerial"); $policy = new WSPolicy(array("security"=>$sec_array)); $sec_token = new WSSecurityToken(array("privateKey" => $pvt_key, "receiverCertificate" =>$pub_key, "certificate" => $rec_cert_client));     $inputFormatticket = array("nim" => "STRING","datej" => "STRING","cb" => "STRING","fam" => "STRING"); $outputFormatticket = array("resultElement" => "listeticketjourResponse", "rowElement" => "ticket", "elements" => array( "id" => "id", "nul" => "nul", "heure" => "heure", "caisse" => "caisse", "emp" => "emp", "montant" => "montant", "mode" => "mode", "article" => "article", "z" => "z")); $sqlticket = "SELECT id,nul,heure,caisse,emp,montant,mode,article,z FROM ticket_liste_jour(?,?,'HEURE, MONTANT, NB_ARTICLE, PAIEMENT, CAISSE, EMPLOYE','ASC',?,?) ". "as (id int8, nul int8, heure timestamp, caisse int8, emp varchar, montant float8, mode varchar, article int4, z int8 )"; $operationsticket = array("inputFormat" => $inputFormatticket, "sql" => $sqlticket, "outputFormat" => $outputFormatticket);     $operations = array("listeticketjour" => $operationsticket); $actions = array("http://xxx/listeticketjour" => "listeticketjour"); $my_data_service = new DataService(array("config" => $db_config, "operations" => $operations, "actions" => $actions, "policy" => $policy, "securityToken" => $sec_token));   $my_data_service->reply(); ?>   My client : <?php $requestPayloadString = <<<XML <ns1:listeticketjour xmlns:ns1="http://xxx"> <ns1:nim>$nim</ns1:nim> <ns1:datej>$datej</ns1:datej> <ns1:cb>$cb</ns1:cb> <ns1:fam>$fam</ns1:fam> </ns1:listeticketjour> XML; $rec_cert = ws_get_cert_from_file("./keys/servsoapovh9.crt"); $pvt_key = ws_get_key_from_file("./keys/clientsoapovh9.key"); $rec_cert_client = ws_get_cert_from_file("./keys/clientsoapovh9.crt"); $reqMessage = new WSMessage($requestPayloadString, array("to" => "http://xxx/server.php", "action" => "http://xxx/listeticketjour")); $sec_array = array("sign"=>TRUE,"encrypt"=>TRUE, "algorithmSuite" => "Basic256Rsa15", "securityTokenReference" => "IssuerSerial"); $policy = new WSPolicy(array("security"=>$sec_array)); $sec_token = new WSSecurityToken(array("privateKey" => $pvt_key, "receiverCertificate" => $rec_cert, "certificate" => $rec_cert_client)); $client = new WSClient(array("useWSA" => TRUE, "policy" => $policy, "securityToken" => $sec_token));   $resMessage = $client->request($reqMessage); $response = $resMessage->str; ?>