How to delete an Object useing PHP & CURL

I’m trying to delete objects useing CURL,

I’v made some changes on this code:

But I get this error:


Please have a look on my code here and see if you can help to solve this issue.

$file = "cat.jpg";

$accessKeyId = '**********';
$secretKey = '***************';

$longDate = gmdate('Ymd\THis\Z');
$shortDate = gmdate('Ymd');

$cannonical = 'DELETE'.''.PHP_EOL.'x-amz-date:'.$longDate.''.PHP_EOL.'content-length;host;x-amz-content-sha256;x-amz-date';

$cannonical = hash('sha256', $cannonical);

$string = 'AWS4-HMAC-SHA256'.PHP_EOL.''.$longDate.''.PHP_EOL.''.$shortDate.'/sgp1/s3/aws4_request'.PHP_EOL.''.$cannonical;

$signingKey = hash_hmac('sha256', $shortDate, 'AWS4'.$secretKey, true);
$signingKey = hash_hmac('sha256', 'sgp1', $signingKey, true);
$signingKey = hash_hmac('sha256', 's3', $signingKey, true);
$signingKey = hash_hmac('sha256', 'aws4_request', $signingKey, true);
$signature  = hash_hmac('sha256', $signingKey.$string, $signingKey);
$signature  = hash_hmac('sha256', $string, $signingKey);

$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_URL, ''.$file);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Authorization: AWS4-HMAC-SHA256 Credential='.$accessKeyId.'/'.$shortDate.'/sgp1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature='.$signature

curl_setopt($ch, CURLOPT_POSTFIELDS, $file);
$result = curl_exec($ch);

Thanks heaps.

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