curl_exec() argument removing last 2 digit of integer - php

Question

I'm using softtouch API with WordPress, and posting data to API via curl.
But in response I am not able to send the big integer value in function. I'm not getting is that data type range issue or curl.
Below is my code:
//create reservation
$prod_items = array();
$single_item = array('product_uid'=>11449701010101);
$prod_items[] = $single_item;
$res_params = array(
'customer_id' => 1111,
'payment_type' => '',
'invoice_address_id' => 123,
'delivery_address_id' => 142,
'giftlist_id' => '',
'store_id' => '',
'items' => $prod_items
);
$res_url = $base_url . 'reservations';
$res_content = json_encode($res_params);
$res_curl = curl_init();
curl_setopt($res_curl, CURLOPT_HTTPHEADER, array('Authorization: ' . $authToken, 'Content-Type: application/json'));
curl_setopt($res_curl, CURLOPT_POST, true);
curl_setopt($res_curl, CURLOPT_POSTFIELDS, $res_content);
curl_setopt($res_curl, CURLOPT_URL, $res_url);
curl_setopt($res_curl, CURLOPT_RETURNTRANSFER, true);
$res_response = curl_exec($res_curl);
if ($res_response === FALSE)
die(curl_error($res_curl));
curl_close($res_curl);
$res_array = json_decode($res_response);
While sending data to the curl_exec() function it removes the last two digits of the product_uid, as I passed it 11449701010101 it send it as 114497010101.
Is that any integer range issue or something curl function issue?

Answer 1

tl:dr There would seem to be something else (in the script that processes the CURL request) that is truncating the product_uid. (?)
array('product_uid'=>11449701010101)
If you are on a 32 bit system (PHP compiled as 32 bit) then 11449701010101 does exceed the 32 bit integer range. However, in such cases, PHP silently converts the number to a float and nothing is "lost" in this instance.
json_encode($res_params);
The PHP function json_encode() converts the passed array into a string respresentation (JSON string). Nothing is lost. The 11449701010101 value is preserved.
While sending data to the curl_exec() function it removes the last two digits
The (POST) data being transmitted is an ordinary string, so nothing can be lost to the individual properties at this stage.
If the receiving script then decodes the transmitted JSON string, encodes it again and sends it back, the data is returned intact. The product_uid is a float, not an integer (as it is in the original data).
If you specifically force 11449701010101 to an integer (eg. (int)11449701010101) then you get -681801035 - the last 2 digits are not simply truncated. For the last 2 digits to be truncated there would seem to be some kind of string manipulation going on?
So, there would seem to be something else (not shown here) during the processing of this data that is perhaps truncating the value. (?)