Supported Versions: PHP 5 >= 5.1.2, PHP 7, PHP 8, PECL hash >= 1.1
Generate a hash value (message digest)
hash(    string $algo,    string $data,    bool $binary false,    array $options = []): string
        $query_string substr($query_string0, -1);



        
$canonical_request "GET\n" $encoded_uri "\n" $query_string "\n" $header_string "\n" $signed_headers_string "\nUNSIGNED-PAYLOAD";

        
$string_to_sign $algorithm "\n" $time_text "\n" $scope "\n" hash('sha256'$canonical_request,

                
false);

        
$signing_key hash_hmac('sha256''aws4_request',

            
hash_hmac('sha256''s3',

                
hash_hmac('sha256'$AWSRegion,
        $query_string substr($query_string0, -1);



        
$canonical_request "GET\n" $encoded_uri "\n" $query_string "\n" $header_string "\n" $signed_headers_string "\nUNSIGNED-PAYLOAD";

        
$string_to_sign $algorithm "\n" $time_text "\n" $scope "\n" hash('sha256'$canonical_request,

                
false);

        
$signing_key hash_hmac('sha256''aws4_request',

            
hash_hmac('sha256''s3',

                
hash_hmac('sha256'$AWSRegion,
        $query_string substr($query_string0, -1);



        
$canonical_request "GET\n" $encoded_uri "\n" $query_string "\n" $header_string "\n" $signed_headers_string "\nUNSIGNED-PAYLOAD";

        
$string_to_sign $algorithm "\n" $time_text "\n" $scope "\n" hash('sha256'$canonical_request,

                
false);

        
$signing_key hash_hmac('sha256''aws4_request',

            
hash_hmac('sha256''s3',

                
hash_hmac('sha256'$AWSRegion,