How to put PHP image resource into Amazon Web Services? - php

Question

I am currently building a Zend Framework PHP web service that take an image uploaded from Android phone, resize it, and put it into Amazon Web Services S3.
Here are my codes:
$img = $_FILES['image'];
if(!$img)
{
return null;
}
if((($img['type'] == 'image/gif') ||
($img['type'] == 'image/jpeg') ||
($img['type'] == 'image/png')) &&
($img['size'] < 1048576))
{
if($img['error'] >0)
{
throw new Exception("image contain error ");
}
$size24 = 24;
//obtain the auth settings
$bootstrap = $this->getInvokeArg('bootstrap');
$awsConfigs = $bootstrap->getOption('aws');
$s3 = new Zend_Service_Amazon_S3($awsConfigs['appkey'], $awsConfigs['secretkey']);
$bucketName = 'item';
$folderName = 'image';
$perms = array(
Zend_Service_Amazon_S3::S3_ACL_HEADER =>
zend_service_amazon_s3::S3_ACL_PUBLIC_READ
);
$name = $bucketName.'/'. $folderName .'/'. uniqid() .'_'. Zend_Date::now()->toString('yyyyMMdd');
$smallPath = $name . '_32.png';
//resize and upload 24x24 image
$srcImg = imagecreatefrompng($img['tmp_name']);
$tmp = imagecreatetruecolor($size24, $size24);
list($oriWidth, $oriHeight) = getimagesize($img['tmp_name']);
imagecopyresampled($tmp, $srcImg, 0, 0, 0, 0, $size24, $size24, $oriWidth, $oriHeight);
//not working
imagepng($tmp, "tmp_32.png")
$smallret = $s3->putFile("tmp_32.png", $smallPath, $perms);
imagedestroy($tmp);
imagedestroy($srcImg);
}
else
{
throw new Exception("image size/format not qualified.");
}
I am thinking a way to convert the image resource to stream, so I can use $s3->putFileStream or putObject method, but I can't find a valid way.
Any idea??

Answer 1

Here is how you'll get your image into a variable without writing to a file:
ob_start();
imagepng($image);
$image_data = ob_get_contents();
ob_end_clean();
If you have the file contents in a variable, you can use putObject. Here's our example where we use file_get_contents. Notice we're getting all the S3 paths out of our Zend config file.
$image_data = file_get_contents(<filename>);
$aws_accesskey = Zend_Registry::get('config')->amazon->accesskey;
$aws_secret = Zend_Registry::get('config')->amazon->secret;
$s3 = new Zend_Service_Amazon_S3($aws_accesskey, $aws_secret);
$image_path = Zend_Registry::get('config')->amazon->s3->assetsbucket . "/images/$filename";
$s3->putObject($image_path, $image_data, array(Zend_Service_Amazon_S3::S3_ACL_HEADER => Zend_Service_Amazon_S3::S3_ACL_PUBLIC_READ));
}