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(PHP Extension) Azure Blob - Get Tags (Check if Blob Exists)

See more Azure Cloud Storage Examples

Gets the user-defined tags for a specified blob. This can also be used as a way to check to see if a blob exists.

For more information, see https://learn.microsoft.com/en-us/rest/api/storageservices/get-blob-tags

Chilkat PHP Downloads

PHP Extension for Windows, Linux, MacOS,
Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$rest = new CkRest();

// Connect to the Azure Storage Blob Service
$bTls = true;
$port = 443;
$bAutoReconnect = true;
// In this example, the storage account name is "chilkat".
$success = $rest->Connect('chilkat.blob.core.windows.net',$port,$bTls,$bAutoReconnect);
if ($success != true) {
    print $rest->lastErrorText() . "\n";
    exit;
}

// Provide Azure Cloud credentials for the REST call.
$azAuth = new CkAuthAzureStorage();
$azAuth->put_AccessKey('AZURE_ACCESS_KEY');
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
$azAuth->put_Account('chilkat');
$azAuth->put_Scheme('SharedKey');
$azAuth->put_Service('Blob');
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
$azAuth->put_XMsVersion('2021-08-06');
$success = $rest->SetAuthAzureStorage($azAuth);

// Note: The application does not need to explicitly set the following
// headers: Content-Length, x-ms-date, Authorization.  These headers
// are automatically set by Chilkat.

// The Azure blob container is "test", the file is "helloWorld.txt"
// Add "?comp=tags" to get the user-defined tags instead of the actual blob content.
$sb = new CkStringBuilder();
$success = $rest->FullRequestNoBodySb('GET','/test/helloWorldajdfadf.txt?comp=tags',$sb);
if ($success == false) {
    // Examine the request/response to see what happened.
    print 'response status code = ' . $rest->get_ResponseStatusCode() . "\n";
    print 'response status text = ' . $rest->responseStatusText() . "\n";
    print 'response header: ' . $rest->responseHeader() . "\n";
    print '---' . "\n";
    print 'LastRequestStartLine: ' . $rest->lastRequestStartLine() . "\n";
    print 'LastRequestHeader: ' . $rest->lastRequestHeader() . "\n";
    exit;
}

// A typical blob with no tags will return this:

// <?xml version="1.0" encoding="utf-8"?>
// <Tags><TagSet/></Tags>

// If the blob does not exist, you get this:

// <?xml version="1.0" encoding="utf-8"?>
// <Error>
//     <Code>BlobNotFound</Code>
//     <Message>The specified blob does not exist.
// 	RequestId:fcfefdd9-301e-001a-2135-3a23d2000000
// 	Time:2023-02-06T14:17:00.7805577Z
//     </Message>
// </Error>

print $sb->getAsString() . "\n";

// To see if we got Tags or an Error, then examine the XML.
$xml = new CkXml();
$xml->LoadSb($sb,true);

// Examine the tag..
if ($xml->TagEquals('Tags') == true) {
    print 'Blob exists!' . "\n";
}
else {

    if ($xml->ChildContentMatches('Code','BlobNotFound',true) == true) {
        print 'Blob does not exist.' . "\n";
    }
    else {
        print 'Some other error...' . "\n";
    }

}

print 'Success.' . "\n";

?>

 

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