PHP ActiveX GMail: Get a specific message (format="metadata")

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Gets a specific message using format=metadata.

Documentation: https://developers.google.com/gmail/api/v1/reference/users/messages/get

<?php

$rest = new COM("Chilkat_9_5_0.Rest");

//   Provide a previously obtained OAuth2 access token.
$oauth2 = new COM("Chilkat_9_5_0.OAuth2");
$oauth2->AccessToken = 'OAUTH2_ACCESS_TOKEN';
$rest->SetAuthOAuth2($oauth2);

$success = $rest->Connect('www.googleapis.com',443,1,1);
if ($success != 1) {
    print $rest->LastErrorText . "\n";
    exit;
}

$rest->AddPathParam('messageId','15fc23688c553739');

$rest->AddQueryParam('format','metadata');

$sbJson = new COM("Chilkat_9_5_0.StringBuilder");
$success = $rest->FullRequestNoBodySb('GET','/gmail/v1/users/me/messages/messageId',$sbJson);
if ($success != 1) {
    print $rest->LastErrorText . "\n";
    exit;
}

if ($rest->ResponseStatusCode != 200) {
    print 'Received error response code: ' . $rest->ResponseStatusCode . "\n";
    print 'Response body:' . "\n";
    print $sbJson->getAsString() . "\n";
    exit;
}

$json = new COM("Chilkat_9_5_0.JsonObject");
$json->LoadSb($sbJson);

//  The following code parses the JSON response.
//  A sample JSON response is shown below the sample code.

$id = $json->stringOf('id');
$threadId = $json->stringOf('threadId');
$snippet = $json->stringOf('snippet');
$historyId = $json->stringOf('historyId');
$internalDate = $json->stringOf('internalDate');
$payloadMimeType = $json->stringOf('payload.mimeType');
$sizeEstimate = $json->IntOf('sizeEstimate');
$i = 0;
$count_i = $json->SizeOfArray('labelIds');
while ($i < $count_i) {
    $json->I = $i;
    $strVal = $json->stringOf('labelIds[i]');
    $i = $i + 1;
}

$i = 0;
$count_i = $json->SizeOfArray('payload.headers');
while ($i < $count_i) {
    $json->I = $i;
    $name = $json->stringOf('payload.headers[i].name');
    $value = $json->stringOf('payload.headers[i].value');
    $i = $i + 1;
}

print 'Example Completed.' . "\n";

?>

Sample JSON Response Body

{
  "id": "15fc23688c553739",
  "threadId": "15fc23688c553739",
  "labelIds": [
    "IMPORTANT",
    "SENT",
    "INBOX"
  ],
  "snippet": "This is a test. \u200b",
  "historyId": "1438",
  "internalDate": "1510791874000",
  "payload": {
    "mimeType": "multipart/mixed",
    "headers": [
      {
        "name": "MIME-Version",
        "value": "1.0"
      },
      {
        "name": "Received",
        "value": "by 10.25.23.105 with HTTP; Wed, 15 Nov 2017 16:24:34 -0800 (PST)"
      },
      {
        "name": "X-Originating-IP",
        "value": "[2601:249:e00:9093:e894:b27f:e5d6:d01d]"
      },
      {
        "name": "Date",
        "value": "Wed, 15 Nov 2017 18:24:34 -0600"
      },
      {
        "name": "Delivered-To",
        "value": "matt@chilkat.io"
      },
      {
        "name": "Message-ID",
        "value": "\u003cCAPhjyBM1qqXS6NVB65W8Zt5-McF03qWSRDjW5am66wTMuard=w@mail.gmail.com\u003e"
      },
      {
        "name": "Subject",
        "value": "Test HTML email with image and attachment."
      },
      {
        "name": "From",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "To",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "Content-Type",
        "value": "multipart/mixed; boundary=\"001a11401a6c097887055e0ea572\""
      }
    ]
  },
  "sizeEstimate": 11716
}