AWS PHP SDK getting class not found fatal error

I'm trying to read messages from my SQS but I can't get that far as I'm having trouble installing the PHP SDK.

I followed the instructions and installed via composer.

My code for testing purposes is:

require 'vendor/autoload.php';
$sqs_credentials = array(
        'region' => 'us-west-2',
        'version' => 'latest',
        'credentials' => array(
            'key'    => '*****',
            'secret' => '**********',

    $sqs_client = new SqsClient($sqs_credentials);

This simply results in

Class 'SqsClient' not found in /var/www/html/sqs_test.php on line 10

I then tried by downloading the zip file directly and used

require 'aws/aws-autoloader.php';

This resulted in the exact same error. What am I doing wrong? I'm quite certain the path is accurate as I can output text directly on Sqs/SqsClient.php.


Still not sure why the above didn't work, but if anyone is trying, this does work:

require 'vendor/autoload.php';
use Aws\Sqs\SqsClient;

$client = SqsClient::factory(array(
        'region' => 'us-west-2',
        'version' => 'latest',
        'credentials' => array(
            'key'    => '********',
            'secret' => '********',

$result = $client->receiveMessage(array(
    'QueueUrl' => $sqs_url

The class you're trying to instantiate is namspaced. Remember to include a use Aws\Sqs\SqsClient; statement before referring to the class by its short name.

Somewhat related but not exactly this issue. I had a class not found for Aws\Sns\MessageValidator (& Message) and after some struggle found out that latest SDK v3.17.3 for PHP didn't have them under \Sns - I simply rolled back to an earlier version 3x and corrected the import path to get the class we needed. Posting here thinking it may of help to someone.

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