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$theResourceObj = Invoice::create([
     "Line" => [
   [
     "Amount" => 100.00,
     "DetailType" => "SalesItemLineDetail",
     "SalesItemLineDetail" => [
       "ItemRef" => [
         "value" => 1,
         "name" => "Services"
        ]
      ]
      ]
    ],
   "CustomerRef"=> [
      "value"=> 1
   ]
]);
// Run a batch
$batch = $dataService->CreateNewBatch();
$batch->AddQuery("select * from Customer startPosition 0 maxResults 5", "queryCustomer");
$batch->AddQuery("select * from Vendor startPosition 0 maxResults 5", "queryVendor");
$batch->AddEntity($theResourceObj, "CreateInvoice", "Create");
$batch->ExecuteWithRequestID("ThisIsMyFirstBatchRequest");
$error = $batch->getLastError();
if ($error) {
    echo "The Status code is: " . $error->getHttpStatusCode() . "\n";
    echo "The Helper message is: " . $error->getOAuthHelperError() . "\n";
    echo "The Response message is: " . $error->getResponseBody() . "\n";
    exit();
}

// Echo some formatted output
$batchItemResponse_createInvoice = $batch->intuitBatchItemResponses["CreateInvoice"];
if($batchItemResponse_createInvoice->isSuccess()){
    $createdInvoice = $batchItemResponse_createInvoice->getResult();
    echo "Create Invoice success!:\n";
    $xmlBody = XmlObjectSerializer::getPostXmlFromArbitraryEntity($createdInvoice, $something);
    echo $xmlBody . "\n";
}else{
    $result = $batchItemResponse_createInvoice->getError();
    var_dump($result);
}