asked on September 14, 2021 Show version history

Hello all

I recently found this post back from awhile ago.

In the post, the Laserfiche Developer makes mention of two "hidden parameters" that exist in Workflow and they can be passed when starting a Workflow. These two Hidden Parameters are $SyncWebAddress and $SyncMethod.

We were able to utilize these parameters and make a webhook in PHP that gets a response back from a workflow. This response also contains output parameters that the developer can set in workflow. The response comes in XML.

So one can pass $SyncWebAddress = "URL of webhook" and $SyncMethod = "WebService" and have the Workflow POST to a Webhook. This examples just writes the response to a JSON file, but obviously other methods could be used.

    $headerStringValue = $_SERVER["HTTP_LFWF_INSTANCE_ID"];
    $fileName = "$headerStringValue.json";

    $data = file_get_contents("php://input");

    $xml = simplexml_load_string($data, "SimpleXMLElement", LIBXML_NOCDATA);
    $json = json_encode($xml, JSON_PRETTY_PRINT);

    file_put_contents($fileName, $json);

With the output file consisting of


    "Parameter": {
        "@attributes": {
            "Style": "Output",
            "Name": "message",
            "Multivalued": "false"
        "Values": {
            "Value": "Hello World 9\/14\/2021 1:17:57 PM"

 I understand using this method there could be some concerns, long running Workflows, etc, I get all that, but I have questions surrounding hidden parameters in Workflow

  1. What other hidden Parameters exist when starting a Workflow with the Workflow Web Services? Right now I only have two, is there more? I can't find any documentation pertaining to them other than the one workflow answer from several years ago.
  2. What OTHER SyncMethods exist? Obviously more $SyncMethods have to exist besides "WebService", otherwise SyncMethod wouldn't even be an option, I would just pass $SyncWebAddress and be done. Can I do something like

    $SyncMethod = File
    $SyncFilePath = "C:\PathToFileHere.xml" ?



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