CakePHP implementation of Amazon AWS SDK For PHP 2 to implement uploading a file to S3 bucket, listing the content, and deleting items.

aws.class.php

<?php
/*
  This is a fully working Class to upload, list and delete items from an Amazon S3 bucket.
  Add your Config::write/Config::read variables as appropriate. Presumed region: US_EAST_1
	Download the most recent cacert.pem from http://curl.haxx.se/docs/caextract.html
	To install on a new machine, create a file called composer.json and add this:
	{
	  "require": {
		  "aws/aws-sdk-php": "*"
	  }
	}

	Then run php command line commands:
	curl -s "http://getcomposer.org/installer" | php
	php composer.phar install
  
  Add the generated files into your Vendors folder in a sub-folder called "amazonaws"

	Docs:
	http://docs.aws.amazon.com/awssdkdocsphp2/latest/gettingstartedguide/sdk-php2-installing-the-sdk.html
	http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectDELETE.html

	Use:
	App::import('Vendor', 'amazonaws', array('file' => 'amazonaws/s3.class.php'));
	$s3 = new AWS_S3;
	$s3->list_objects();
	$s3->upload("path/to/file.jpg");
	$s3->delete("path/to/file.jpg");
*/

require dirname(__FILE__) .DS.'autoload.php';
use Aws\Common\Aws;
use Aws\Common\Enum\Region;
use Aws\S3\Enum\CannedAcl;
use Aws\S3\Exception\S3Exception;

class AWS_S3{
	private $_s3 = null;

	public function __construct(){
		$aws = Aws::factory(array(
			'key'    => Configure::read('AWS.key'),
			'secret' => Configure::read('AWS.secret'),
			'region' => Region::US_EAST_1,
			'ssl.certificate_authority' => dirname(__FILE__) .DS. 'cacert.pem'
		));
		$this->_s3 = $aws->get('s3');
    }

	public function upload($file_name, $full_path){
		$s3 = $this->_s3;
		try {
			$s3->putObject(array(
				'Bucket' => Configure::read('AWS.bucket'),
				'Key'    => $file_name,
				'Body'   => fopen($full_path, 'r'),
				'ACL'    => CannedAcl::PUBLIC_READ,
				'CAfile' => 'cacert.pem',
				'ssl.CURLOPT_CAINFO' => 'cacert.pem',
				'ssl.certificate_authority' => dirname(__FILE__) .DS. 'cacert.pem'
			));
		} catch (S3Exception $e) {
			echo "The file was not uploaded.\n";
		}
	}

	public function delete($file_name){
		$s3 = $this->_s3;
		try{
			$s3->deleteObject(array(
				'Bucket' => Configure::read('AWS.bucket'),
				'Key'    => $file_name,
				'CAfile' => 'cacert.pem',
				'ssl.CURLOPT_CAINFO' => 'cacert.pem',
				'ssl.certificate_authority' => dirname(__FILE__) .DS. 'cacert.pem'));
		} catch (S3Exception $e) {
			echo "The file was not uploaded.\n";
		}
	}

	public function list_objects(){
		$s3 = $this->_s3;
		$list = array();
		foreach ($s3->getIterator('ListBuckets') as $bucket) {
			foreach ($s3->getIterator('ListObjects', array('Bucket' => $bucket['Name'])) as $object) {
				echo $bucket['Name'] . '/' . $object['Key'] . PHP_EOL;
				array_push($list, $object['Key']);
			}
		}
		return $list;
	}
}