Example 1: Single file form post.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<?php
$form = array(
'AWSAccessKeyId' => 'your access key',
'acl' => 'public-read',
'success_action_redirect' => 'http://yourdomain/uploadpicture.php',
);
$form['policy'] = '{
"expiration": "2016-12-01T12:00:00.000Z",
"conditions": [
{
"acl": "'.$form['acl'].'"
},
{
"success_action_redirect": "'.$form['success_action_redirect'].'"
},
{
"bucket": "yourbucketname"
},
["starts-with", "$key", "uploads/"],
]
}';
$form['policy_encoded'] = base64_encode($form['policy']);
$mysecretkey="your secret key";
$mysignature = base64_encode(hash_hmac('sha1',$form['policy_encoded'] , $mysecretkey, true));
?>
<form action="https://yourbucket.s3.amazonaws.com/" method="post" enctype="multipart/form-data">
<input type="hidden" name="key" value="uploads/${filename}">
<input type="hidden" name="AWSAccessKeyId" value="<?php echo $form['AWSAccessKeyId'] ?>">
<input type="hidden" name="acl" value="<?php echo $form['acl'] ?>">
<input type="hidden" name="success_action_redirect" value="<?php echo $form['success_action_redirect'] ?>">
<input type="hidden" name="policy" value="<?php echo $form['policy_encoded'] ?>">
<input type="hidden" name="signature" value="<?php echo $mysignature; ?>">
File to upload to S3:
<input name="file" type="file">
<br>
<input type="submit" value="Upload File to S3">
</form>
</body>
</html>