Containers listing in Windows Azure SDK for PHP - php

Question

I am trying to list the containers and so far having no luck at all... i already tried
$aBlobContainer = $blobRestProxy->listContainers();
for($i = 0;$i<= count($aBlobContainer); $i++)
{
echo 'Blob Container name is: '.$aBlobContainer[$i]->Name."\n";
}
but i am having error
Cannot use object of type WindowsAzure\Blob\Models\ListContainersResult as array
Been trying to work around it all day just can't seem to make any progress... let me know if i am doing something silly or if there is a better way to find out if the container already exist? Thanks!
EDIT:
var_dump of the variable $aBlobContainer came up as
object(WindowsAzure\Blob\Models\ListContainersResult)#42 (5) {
["_containers":"WindowsAzure\Blob\Models\ListContainersResult":private]=>
array(2) {
[0]=>
object(WindowsAzure\Blob\Models\Container)#48 (4) {
["_name":"WindowsAzure\Blob\Models\Container":private]=>
string(6) "abc123"
["_url":"WindowsAzure\Blob\Models\Container":private]=>
string(48) "http://orig.blob.core.windows.net/abc123"
["_metadata":"WindowsAzure\Blob\Models\Container":private]=>
array(0) {
}
["_properties":"WindowsAzure\Blob\Models\Container":private]=>
object(WindowsAzure\Blob\Models\ContainerProperties)#47 (2) {
["_lastModified":"WindowsAzure\Blob\Models\ContainerProperties":private]=>
object(DateTime)#49 (3) {
["date"]=>
string(19) "2012-11-29 01:32:20"
["timezone_type"]=>
int(2)
["timezone"]=>
string(3) "GMT"
}
["_etag":"WindowsAzure\Blob\Models\ContainerProperties":private]=>
string(19) ""0x8CF9BE88256926F""
}
}
[1]=>
object(WindowsAzure\Blob\Models\Container)#46 (4) {
["_name":"WindowsAzure\Blob\Models\Container":private]=>
string(8) "multi123"
["_url":"WindowsAzure\Blob\Models\Container":private]=>
string(50) "http://orig.blob.core.windows.net/multi123"
["_metadata":"WindowsAzure\Blob\Models\Container":private]=>
array(0) {
}
["_properties":"WindowsAzure\Blob\Models\Container":private]=>
object(WindowsAzure\Blob\Models\ContainerProperties)#45 (2) {
["_lastModified":"WindowsAzure\Blob\Models\ContainerProperties":private]=>
object(DateTime)#53 (3) {
["date"]=>
string(19) "2012-11-29 03:13:16"
["timezone_type"]=>
int(2)
["timezone"]=>
string(3) "GMT"
}
["_etag":"WindowsAzure\Blob\Models\ContainerProperties":private]=>
string(19) ""0x8CF9BF69C25759F""
}
}
}
["_prefix":"WindowsAzure\Blob\Models\ListContainersResult":private]=>
NULL
["_marker":"WindowsAzure\Blob\Models\ListContainersResult":private]=>
NULL
["_nextMarker":"WindowsAzure\Blob\Models\ListContainersResult":private]=>
NULL
["_maxResults":"WindowsAzure\Blob\Models\ListContainersResult":private]=>
NULL
}

Answer 1

Looking at the Source Code:
$blobContainers = $blobRestProxy->listContainers(); //returns ListContainersResult
in order to get the listing of containers you'd have to do a subsequent call of:
$blobContainerArray = $blobContainers->getContainers(); //exposes the array of containers
Then you should be able to use that array in either a foreach or for statement. This workflow matches that of returning a list of blobs from within a container as seen in the README.md file:
try {
// List blobs.
$blob_list = $blobRestProxy->listBlobs("mycontainer");
$blobs = $blob_list->getBlobs();
foreach($blobs as $blob)
{
echo $blob->getName().": ".$blob->getUrl()."<br />";
}
} catch(ServiceException $e){
$code = $e->getCode();
$error_message = $e->getMessage();
echo $code.": ".$error_message."<br />";
}

Answer 2

$options = new ListContainersOptions();
$options->setPrefix("prefixxxx");
$blobContainers = $blobRestProxy->listContainers($options);
$blobContainerArray = $blobContainers->getContainers();
foreach ($blobContainerArray as $container)
{
Trace("Container: " . $container->getName());
}

Answer 3

From the error message, it looks like $blobRestProxy->listContainers() is returning an object. Try the code below.
$aBlobContainer = $blobRestProxy->listContainers();
foreach($aBlobContainer as $row) {
echo 'Blob Container name is: '.$row->Name."\n";
}
When accessing $aBlobContainer as an array (i.e. $aBlobContainer[$i]), it was probably giving the error.
* Edit *
foreach($aBlobContainer as $key => $row) {
echo $row->Name . "\n";
}