Object Storage Service:Download por intervalo (OSS SDK for PHP 2.0)

Pré-requisitos

• O código de exemplo neste tópico usa o endpoint público da região China (Hangzhou) (cn-hangzhou) como exemplo. Se você acessar o OSS a partir de outro service do Alibaba Cloud na mesma região, use um endpoint interno. Para obter mais informações sobre os mapeamentos entre regiões e endpoints compatíveis com o OSS, consulte Regions and endpoints.

• Para usar o download por intervalo, é necessário ter a permissão oss:GetObject. Para obter mais informações, consulte Grant custom access policies to RAM users.

Código de exemplo

O código de exemplo a seguir mostra como baixar dados de um intervalo especificado de um objeto ao adicionar o cabeçalho de solicitação RangeBehavior:standard.

<?php

// Import the autoloader file to ensure that dependency libraries are correctly loaded.
require_once __DIR__ . '/../vendor/autoload.php';

use AlibabaCloud\Oss\V2 as Oss;

// Define the description of command line arguments.
$optsdesc = [
    "region" => ['help' => 'The region in which the bucket is located.', 'required' => True], // The region where the bucket is located. This parameter is required.
    "endpoint" => ['help' => 'The domain names that other services can use to access OSS.', 'required' => False], // The endpoint. This parameter is optional.
    "bucket" => ['help' => 'The name of the bucket', 'required' => True], // The bucket name. This parameter is required.
    "key" => ['help' => 'The name of the object', 'required' => True], // The object name. This parameter is required.
];

// Convert the argument descriptions to the long option format required by getopt.
// A colon (:) after each argument indicates that the argument requires a value.
$longopts = \array_map(function ($key) {
    return "$key:";
}, array_keys($optsdesc));

// Parse the command line arguments.
$options = getopt("", $longopts);

// Verify that all required arguments are specified.
foreach ($optsdesc as $key => $value) {
    if ($value['required'] === True && empty($options[$key])) {
        $help = $value['help']; // Obtain the help information for the argument.
        echo "Error: the following arguments are required: --$key, $help" . PHP_EOL;
        exit(1); // If a required argument is missing, exit the program.
    }
}

// Extract values from the parsed arguments.
$region = $options["region"]; // The region where the bucket is located.
$bucket = $options["bucket"]; // The bucket name.
$key = $options["key"];       // The object name.

// Load the credentials from environment variables.
// Use EnvironmentVariableCredentialsProvider to read the Access Key ID and Access Key Secret from environment variables.
$credentialsProvider = new Oss\Credentials\EnvironmentVariableCredentialsProvider();

// Use the default configurations of the SDK.
$cfg = Oss\Config::loadDefault();
$cfg->setCredentialsProvider($credentialsProvider); // Set the credentials provider.
$cfg->setRegion($region); // Set the region where the bucket is located.
if (isset($options["endpoint"])) {
    $cfg->setEndpoint($options["endpoint"]); // If an endpoint is provided, set the endpoint.
}

// Create an OSS client instance.
$client = new Oss\Client($cfg);

// Specify the standard download behavior. In this example, the value is set to 'standard'.
$rangeBehavior = 'standard';

// Specify the Range request header to retrieve a part of the object.
$rangeHeader = 'bytes=0-10';

// Create a GetObjectRequest object to retrieve the content of the specified object.
$request = new Oss\Models\GetObjectRequest(
            bucket: $bucket,
            key: $key,
            rangeBehavior: $rangeBehavior,
            rangeHeader: $rangeHeader);

// Execute the GetObject operation.
$result = $client->getObject($request);

// Print the result.
// Output the HTTP status code, request ID, and object content.
printf(
    'status code:' . $result->statusCode . PHP_EOL . // The HTTP status code. For example, 200 indicates that the request is successful.
    'request id:' . $result->requestId . PHP_EOL . // The request ID, which is used for debugging or request tracking.
    'object content:' . $result->body->getContents() . PHP_EOL // The object content.
);