Amazon S3: Uncaught Error: Class 'S3Client' not found - php

Question

I'm trying to upload a .zip file to the Amazon S3 service but I keep getting the error:
Uncaught Error: Class 'S3Client' not found in /class/database.class.php:411
This is the basis of the code. I have the exit() from trying to debug. The class_exists function specifis that the S3Client exists and echo's "Class!!!" to the page.
I added an echo statement in the amazon autoload file and it echo's that so it is finding the autoload files.
Why can't PHP find the class when trying to call it?
My Amazon Class
require_once( $path["full"].'/assets/vendor/amazon-s3/aws-autoloader.php' );
use Aws\S3\S3Client;
class amazons3 {
// For future use to build some functions to help.
}
My-Autoload
//Misc Functions Above
include('/path/to/amazon-s3.class.php')
//Misc Functions Below
Inside Back-up Database Function
include('/path/to/my/my-autoload.class.php');
if(class_exists('Aws\S3\S3Client')) {
echo "CLASS!!!";
/* Line 411 */ $s3 = new S3Client([
'version' => 'latest',
'region' => 'us-west-2'
]);
}
else {
echo "No Class";
}
exit(0);
try {
$s3->putObject([
'Bucket' => $data["domain"],
'Key' => 'my-object',
'Body' => fopen($zipName, 'r'),
'ACL' => 'public-read',
]);
} catch (Aws\S3\Exception\S3Exception $e) {
echo "There was an error uploading the file.\n";
}
Update
I am not using composer; I downloaded the package and uploaded it to my server.
I've still had no luck with getting this to recognize the S3Client class. I added an echo to the top of the S3Client.php right above the class that is in the amazon package to see if it is included and it is and echoed out the string on my page, so from everything I know, all Amazon class files are included.
Update 2
I added the include files to the include of the Amazon autoloader.

Answer 1

In your class_exists call, you specify the fully-qualified class name (with its namespace):
if(class_exists('Aws\S3\S3Client')) {
echo "CLASS!!!";
}
But when you try to instantiate it, you use just the class name:
/* Line 411 */ $s3 = new S3Client([
'version' => 'latest',
'region' => 'us-west-2'
]);
Note that the error message doesn't include the namespace Aws\S3, because PHP doesn't know that S3Client should actually mean Aws\S3\S3Client.
If you instantiate the class with its fully-qualified name it will work:
/* Line 411 */ $s3 = new Aws\S3\S3Client([
'version' => 'latest',
'region' => 'us-west-2'
]);
For the name S3Client to expand to Aws\S3\S3Client, your code needs to either a) be inside the Aws\S3 namespace; or b) have an appropriate use statement at the top of the file.
The important thing to remember is that namespace and use statements only affect the current file, they can't be loaded via a require/include.
So this will also work:
/* top of file */
use Aws\S3\S3Client;
// ...
/* Line 411 */ $s3 = new S3Client([
'version' => 'latest',
'region' => 'us-west-2'
]);
The name you use for the class can be different in every file, with use ... as, so you can also do this:
/* top of file */
use Aws\S3\S3Client as AmazonS3;
use Something\Else as S3Client;
// ...
/* Line 411 */ $s3 = new AmazonS3([
'version' => 'latest',
'region' => 'us-west-2'
]);
To see what PHP resolves a bare class name to in a particular file, you can use the magic ::class suffix, which just expands the name according to current namespace and use rules (even if there isn't actually a class with that name):
if ( class_exists(S3Client::class) ) {
echo 'Class exists: ' . S3Client::class;
}
else {
echo 'Class does not exist: ' . S3Client::class;
}
This is almost always what you want to do when you want a fully-qualified class name in a string.