Zend Framework 101: Zend_Service_Amazon_S3

By Quentin Zervaas, 6 March 2010 Amazon PHP Zend Framework Download PDF

Reading Objects

The methods used to retrieve objects from a bucket are getObject() and getObjectStream(). You can usegetObject() to return the object data into a PHP variable, while getObjectStream() is most useful for writing an object directly to your local filesystem.

For now, we'll just look getObject(). This method accepts as its only argument the name of the object, and returns the data found in the object. If the object can't be returned then false is returned instead.

The following listing demonstrates combining a call to getInfo() and getObject() so you can send the file back to the end-user. It retrieves the information about the file first so it can determine the mime type and file size.

Listing 11 Sending an object directly from an S3 bucket (get-object.php)

<?php
    require_once('Zend/Service/Amazon/S3.php');
 
    $awsKey       = '[your key]';
    $awsSecretKey = '[your secret key]';
 
    $s3 = new Zend_Service_Amazon_S3($awsKey, $awsSecretKey);
 
    $bucketName = 'phpriot-test-bucket';
    $objectName = $bucketName . '/my-file.txt';
 
    $info = $s3->getInfo($objectName);
 
    if (is_array($info)) {
        header('Content-type: ' . $info['type']);
        header('Content-length: ' . $info['size']);
 
        echo $s3->getObject($objectName);
    }
    else {
        header('HTTP/1.0 404 Not Found')
    }
?>

This example is really just for demonstration purposes only. If you were using Amazon S3 as a content delivery network it would be completely redundant (not to mention much slower) to read in the files and send to users as requested.

• Next: Using Objects Stored in Amazon S3 Buckets