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Object Storage Service:Query the tags of an object in PHP

Last Updated:Mar 08, 2024

After you configure tags for an object, you can query the tags of the object. If versioning is enabled for a bucket that stores the object whose tags you want to query, Object Storage Service (OSS) returns the tags of the current version of the object by default. To query the tags of a specified version of the object, you must specify the version ID of the object.

Note
  • An object is a key-value pair that is used to identify objects. For more information about object tags, see Add tags to an object.

  • For more information about how to query tags of an object, see GetObjectTagging.

Usage notes

  • In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS from other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about OSS regions and endpoints, see Regions and endpoints.

  • In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient instance by using custom domain names or Security Token Service (STS), see Create an OSSClient instance.

  • To query the tags of an object, you must have the oss:GetObjectTagging permission. For more information, see Attach a custom policy to a RAM user.

Query the tags of an object

If versioning is not enabled for the bucket that stores the object whose tags you want to query, you can query the tags of the object based on your requirements. If versioning is enabled for the bucket that stores the object whose tags you want to query, OSS returns the tags of the current version of the object by default.

The following sample code provides an example on how to query the tags of the exampleobject.txt object in the exampledir directory of the examplebucket bucket:

<?php
if (is_file(__DIR__ . '/../autoload.php')) {
    require_once __DIR__ . '/../autoload.php';
}
if (is_file(__DIR__ . '/../vendor/autoload.php')) {
    require_once __DIR__ . '/../vendor/autoload.php';
}

use OSS\Credentials\EnvironmentVariableCredentialsProvider;
use OSS\OssClient;
use OSS\CoreOssException;

// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.  
$provider = new EnvironmentVariableCredentialsProvider();
// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
$endpoint = "yourEndpoint";
// Specify the name of the bucket. Example: examplebucket. 
$bucket = "examplebucket";
// Specify the full path of the object. Example: exampledir/exampleobject.txt. Do not include the bucket name in the full path. 
$object = "exampledir/exampleobject.txt";

$config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
    );
    $ossClient = new OssClient($config);

try {
    // Query the tags of the object. 
    $config = $ossClient->getObjectTagging($bucket, $object);
    printf($object." tags are:".$config->serializeToXml(). "\n");
} catch (OssException $e) {
    printf($e->getMessage() . "\n");
    return;
}

Query the tags of a specified version of an object

If versioning is enabled for the bucket that stores the object whose tags you want to query, you can query the tags of a specified version of the object by specifying the version ID of the object.

The following sample code provides an example on how to query the tags of a specified version of the exampleobject.txt object in the exampledir directory of the examplebucket bucket:

Note

For more information about how to obtain version IDs, see List objects.

<?php
if (is_file(__DIR__ . '/../autoload.php')) {
    require_once __DIR__ . '/../autoload.php';
}
if (is_file(__DIR__ . '/../vendor/autoload.php')) {
    require_once __DIR__ . '/../vendor/autoload.php';
}

use OSS\Credentials\EnvironmentVariableCredentialsProvider;
use OSS\OssClient;
use OSS\CoreOssException;

// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.  
$provider = new EnvironmentVariableCredentialsProvider();
// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
$endpoint = "yourEndpoint";
// Specify the name of the bucket. Example: examplebucket. 
$bucket = "examplebucket";
// Specify the full path of the object. Example: exampledir/exampleobject.txt. Do not include the bucket name in the full path. 
$object = "exampledir/exampleobject.txt";
// Specify the version ID of the object. 
$options = array(
    'versionId'=>'CAEQMxiBgICAof2D0BYiIDJhMGE3N2M1YTI1NDQzOGY5NTkyNTI3MGYyMzJm****'
);

$config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
    );
    $ossClient = new OssClient($config);

try {
   // Query the tags of the object version. 
   $config = $ossClient->getObjectTagging($bucket, $object,$options);
   printf($object." tags are:".$config->serializeToXml(). "\n");
} catch (OssException $e) {
   printf($e->getMessage() . "\n");
   return;
}