Process OSS images by using OSS SDK for PHP - Object Storage Service

Image Processing (IMG) is a secure, cost-effective, and highly reliable image processing service that is provided by Object Storage Service (OSS) to help you process images. After you upload source images to OSS, you can call RESTful API operations to process the images anytime, anywhere, and on any connected devices.

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, endpoints and open ports.
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.
OSS allows you to use one or more IMG parameters to process images. For more information, see IMG parameters. For the complete sample code, visit GitHub.

Use IMG parameters to process images

Use a single IMG parameter to process an image and save the processed image to your local computer

<?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;

// 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.jpg. Do not include the bucket name in the full path. 
$object = "exampledir/exampleobject.jpg";
// Specify the full path to which you want to save the processed image. Example: D:\\localpath\\example-resize.jpg. If a file that has the same name already exists, the downloaded object overwrites the file. Otherwise, the downloaded object is saved in the path. 
// If you specify only the name of the file such as example-resize.jpg but do not specify the local path, the file is saved to the path of the project to which the sample program belongs. 
$download_file = "D:\\localpath\\example-resize.jpg";

$config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
        "signatureVersion" => OssClient::OSS_SIGNATURE_VERSION_V4,
        "region"=> "cn-hangzhou"
    );
    $ossClient = new OssClient($config);
// If the image that you want to process does not exist in the specified bucket, you must upload the image to the specified bucket. 
// $ossClient->uploadFile($bucket, $object, "D:\\localpath\\exampleobject.jpg");

// Resize the image to 100 x 100 pixels. 
$options = array(
    OssClient::OSS_FILE_DOWNLOAD => $download_file,
    OssClient::OSS_PROCESS => "image/resize,m_fixed,h_100,w_100" );
// Save the processed image as example-resize.jpg to your local computer. 
$ossClient->getObject($bucket, $object, $options);

// After the image is processed, you can delete the source image from the bucket if you no longer need the image. 
// $ossClient->deleteObject($bucket, $object);

Use multiple IMG parameters to process an image and save the processed image to your local computer

The following sample code provides an example on how to use multiple IMG parameters to process an image. The IMG parameters are separated by forward slashes (/).

<?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;

// 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.jpg. Do not include the bucket name in the full path. 
$object = "exampledir/exampleobject.jpg";
// Specify the full path to which you want to save the processed image. Example: D:\\localpath\\example-new.jpg. If a file that has the same name already exists, the downloaded object overwrites the file. Otherwise, the downloaded object is saved in the path. 
// If you specify only the name of the file such as example-new.jpg but do not specify the local path, the file is saved to the path of the project to which the sample program belongs. 
$download_file = "D:\\localpath\\example-new.jpg";

$config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
        "signatureVersion" => OssClient::OSS_SIGNATURE_VERSION_V4,
        "region"=> "cn-hangzhou"
    );
    $ossClient = new OssClient($config);
// If the image that you want to process does not exist in the specified bucket, you must upload the image to the specified bucket. 
// $ossClient->uploadFile($bucket, $object, "D:\\localpath\\exampleobject.jpg");

// Resize the image to 100 × 100 pixels and rotate the image 90 degrees. 
$style = "image/resize,m_fixed,w_100,h_100/rotate,90";

$options = array(
    OssClient::OSS_FILE_DOWNLOAD => $download_file,
    OssClient::OSS_PROCESS => $style);

// Save the processed image as example-new.jpg to your local computer. 
$ossClient->getObject($bucket, $object, $options);

// After the image is processed, you can delete the source image from the bucket if you no longer need the image. 
// $ossClient->deleteObject($bucket, $object);

Use an image style to process images

You can create an image style in the OSS console and encapsulate multiple IMG parameters in the style. Then, you can use the style to process images. For more information, see Image styles.

The following sample code provides an example on how to use an image style to process an image:

<?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;
// 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.jpg. Do not include the bucket name in the full path. 
$object = "exampledir/exampleobject.jpg";
// Specify the full path to which you want to save the processed image. Example: D:\\localpath\\example-new.jpg. If a file that has the same name already exists, the downloaded object overwrites the file. Otherwise, the downloaded object is saved in the path. 
// If you specify only the name of the file such as example-new.jpg but do not specify the local path, the file is saved to the path of the project to which the sample program belongs. 
$download_file = "D:\\localpath\\example-new.jpg";

$config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
        "signatureVersion" => OssClient::OSS_SIGNATURE_VERSION_V4,
        "region"=> "cn-hangzhou"
    );
    $ossClient = new OssClient($config);

// If the image that you want to process does not exist in the specified bucket, you must upload the image to the specified bucket. 
// $ossClient->uploadFile($bucket, $object, "D:\\localpath\\exampleobject.jpg");

// Use the custom image style to process the image. 
// Set yourCustomStyleName to the name of the image style that you created in the OSS console. 
$style = "style/yourCustomStyleName";

$options = array(
    OssClient::OSS_FILE_DOWNLOAD => $download_file,
    OssClient::OSS_PROCESS => $style);

// Save the processed image as example-new.jpg to your local computer. 
$ossClient->getObject($bucket, $object, $options);

// After the image is processed, you can delete the source image from the bucket if you no longer need the image. 
// $ossClient->deleteObject($bucket, $object);

Save processed images

By default, IMG does not save processed images. You can call the ImgSaveAs operation to save the images to the bucket in which the source images are stored.

The following sample code provides an example on how to save a processed image:

<?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;

// 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 source object. Example: exampledir/exampleobject.jpg. Do not include the bucket name in the full path. 
$object = "exampledir/exampleobject.jpg";
// Specify the full path to which you want to save the processed image. Example: example-new.jpg. 
$save_object = "example-new.jpg";

function base64url_encode($data)
{
    return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
}

$config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
        "signatureVersion" => OssClient::OSS_SIGNATURE_VERSION_V4,
        "region"=> "cn-hangzhou"
    );
    $ossClient = new OssClient($config);
// If the image that you want to process does not exist in the specified bucket, you must upload the image to the specified bucket. 
// $ossClient->uploadFile($bucket, $object, "D:\\localpath\\exampleobject.jpg");

// Resize the image to 100 × 100 pixels and rotate the image 90 degrees. 
$style = "image/resize,m_fixed,w_100,h_100/rotate,90";

$process = $style.
           '|sys/saveas'.
           ',o_'.base64url_encode($save_object).
           ',b_'.base64url_encode($bucket);

// Save the processed image as example-new.png to the current bucket. 
$result = $ossClient->processObject($bucket, $object, $process);
// Display the processing result. 
print($result);

Generate a signed object URL that includes IMG parameters

The URLs of private objects must be signed. IMG parameters cannot be directly added to the end of a signed URL. If you want to process a private object, add IMG parameters to the signature. The following sample code provides an example on how to add IMG parameters to a signature:

<?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;

// 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.jpg. Do not include the bucket name in the full path. 
$object = "exampledir/exampleobject.jpg";

$config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
        "signatureVersion" => OssClient::OSS_SIGNATURE_VERSION_V4,
        "region"=> "cn-hangzhou"
    );
    $ossClient = new OssClient($config);

// Generate a signed URL that includes IMG parameters. The validity period of the URL is 3,600 seconds. The signed URL can be directly used to access the image by using a browser. 
$timeout = 3600;

$options = array(
    // Resize the image to 100 x 100 pixels. 
    OssClient::OSS_PROCESS => "image/resize,m_fixed,h_100,w_100" );

$signedUrl = $ossClient->signUrl($bucket, $object, $timeout, "GET", $options);
print("rtmp url: \n" . $signedUrl);

The following sample code provides an example on how to generate a signed object URL that contains the watermark parameter:

<?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;

// 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.jpg. Do not include the bucket name in the full path. 
$object = "exampledir/exampleobject.jpg";

$config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
        "signatureVersion" => OssClient::OSS_SIGNATURE_VERSION_V4,
        "region"=> "cn-hangzhou"
    );
    $ossClient = new OssClient($config);

// Generate a signed URL that contains the watermark parameter. The validity period of the URL is 3,600 seconds. The signed URL can be directly used to access the image by using a browser. 
$timeout = 3600;

function base64url_encode($data)
{
    return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
}
// Specify the content of the watermark such as Hello World or specify the full path of the watermark image such as panda.jpg. 
// When you add a watermark image to the image, make sure that the watermark image is stored in the same bucket as the image. 
$content = "Hello World";
$string = base64url_encode($content);

$options = array(
    // Add the watermark to the image. 
    OssClient::OSS_PROCESS => "image/watermark,text_".$string
);

$signedUrl = $ossClient->signUrl($bucket, $object, $timeout, "GET", $options);
print("rtmp url: \n" . $signedUrl);