micro uniquestamp, what is this? - php

Question

Im developing a little software based on API requests with php cURL.
I encountered a problem with private requests of API. One of the parameters of the request is "nonce" (unix timestamp), but the response is "invalid nonce".
Contacting the assistance, they answer me that:
"Invalid Nonce is sent when nonce you sent is smaller or equal to the nonce that was previously sent."
And,
"if you make 2 requests at same second you need to increase nonce for 2nd request (you can use micro uniquestamp so that in one second you can create 1000000 unique nonces in 1 second)."
My question is: What function can I use to solve this problem!? I tried microtime() function, but I get the same error.
Thank you and sorry for my bad english.
My code:
$unix_time = time();
$microtime = number_format(microtime(true), 5, '', '')
$message = $unix_time.$customer_id.$API_KEY; //nonce + customer id + api key
$signature = hash_hmac('sha256', $message, $API_SECRET);
$ticker_url = "https://www.bitstamp.net/api/v2/ticker/btceur";
$balance_url = "https://www.bitstamp.net/api/v2/balance/btceur/";
$param_array = array(
"key" => $API_KEY,
"signature" => strtoupper($signature),
"nonce" => $microtime
);
switch($_POST['action']){
case 'ticker_btceur':
ticker_btceur($param_array, $ticker_url);
break;
case 'balance_btceur':
balance_btceur($param_array, $balance_url);
break;
}
function ticker_btceur($da, $b_url){ // cURL GET
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $b_url."?key=".$da['key']."&signature=".$da['signature']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($ch, CURLOPT_CAINFO, getcwd() . "/CAcerts/cacert.pem");
if(curl_exec($ch) === false){
echo "Errore: ". curl_error($ch)." - Codice errore: ".curl_errno($ch);
}
else{
$result = curl_exec($ch);
echo $result;
}
curl_close($ch);
}
function balance_btceur($pa, $b_url){ // cURL POST
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, $b_url);
curl_setopt($ch,CURLOPT_POST, count($pa));
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($pa));
if(curl_exec($ch) === false){
echo "Errore: ". curl_error($ch)." - Codice errore: ".curl_errno($ch);
}
else{
$result = curl_exec($ch);
echo $result;
}
curl_close($ch);
}

Answer 1

microtime() is current Unix timestamp with microseconds and it's different than normal microseconds time (1 sceond = 1000000 microseconds), so they are not the samething.
If the service provider is asking you to send the time in Unix timestamp with microseconds then you have to use:
$time = microtime(true);
Also you can make it random by using rand() to be like that:
// Increase the time in random value between 10 and 100 in microtime
$time = microtime(true) + rand(10, 100);
If they asking you to do it in microseconds time then use rand() like that:
$time = rand(1000,10000000);

Answer 2

Seems that API requires microseconds, here is function to get microseconds:
function microseconds()
{
list($usec, $sec) = explode(" ", microtime());
return $sec . ($usec * 1000000);
}
echo microseconds();
echo "\n";

Answer 3

my best guess is that they mean:
$stamp=(string)(int)(microtime(true)*1000000);
this stamp will change 1 million times per second, depending on when you generate it, it looks something like
string(16) "1555177383042022"
.. just note that this code won't work properly on a 32bit system, if your code needs 32bit php compatibility then do this instead:
$stamp2=bcmul(number_format(microtime(true),18,".",""),"1000000",0);