public function request()
 {
     $this->checkPackageDimensions();
     $param = array('nCdEmpresa' => $this->authCode, 'sDsSenha' => $this->authPass, 'nCdServico' => $this->service, 'sCepOrigem' => $this->zipFrom, 'sCepDestino' => $this->zipTo, 'nVlPeso' => $this->itemWeight, 'nCdFormato' => $this->itemForm, 'nVlComprimento' => $this->itemLength, 'nVlAltura' => $this->itemHeight, 'nVlLargura' => $this->itemWidth, 'nVlDiametro' => $this->itemDiameter, 'sCdMaoPropria' => $this->options['MaoPropria'], 'nVlValorDeclarado' => $this->options['DeclaredValue'], 'sCdAvisoRecebimento' => $this->options['Avis']);
     $webService = new SoapClient(self::URL);
     try {
         $result = $webService->CalcPrecoPrazo($param);
         $this->result = $result->CalcPrecoPrazoResult->Servicos->cServico;
     } catch (SoapFault $sf) {
         throw new Exception($sf->getCode() . ': ' . $sf->getMessage());
     }
 }
<?php

// ex_ws_soap.php
try {
    $client = new SoapClient('http://ws.correios.com.br/calculador/CalcPrecoPrazo.asmx?WSDL', array('trace' => 1));
    $frete = $client->CalcPrecoPrazo(array('nCdEmpresa' => '', 'sDsSenha' => '', 'nCdServico' => '41106', 'sCepOrigem' => 31030430, 'nCepDestino' => 35400000, 'nVlPeso' => 0.3, 'nCdFormato' => 1, 'nVlComprimento' => 30, 'nVlAltura' => 5, 'nVlLargura' => 20, 'nVlDiametro' => 0, 'sCdMaoPropria' => 'N', 'nVlValorDeclarado' => 0, 'sCdAvisoRecebimento' => 'N'));
    $result = $frete->CalcPrecoPrazoResult->Servicos->cServico;
    if ($result->MsgErro != '') {
        throw new Exception($result->MsgErro);
    } else {
        echo "Frete: " . $result->Valor . "<br />Prazo: " . $result->PrazoEntrega . " dia(s)";
    }
} catch (SoapFault $se) {
    echo 'Erro no Soap: ' . $se->getMessage();
} catch (Exception $e) {
    echo 'Erro: ' . $e->getMessage();
    echo "<h1>REQUISIÇÃO:</h1><pre>";
    echo $client->__getLastRequestHeaders();
    echo htmlentities($client->__getLastRequest());
    // xml
    echo "<h1>RESPOSTA:</h1>";
    echo $client->__getLastResponseHeaders();
    echo htmlentities($client->__getLastResponse());
    // xml
}