Receive JSON POST with PHP

Question

I’m trying to receive a JSON POST on a payment interface website, but I can’t decode it.

When I print :

echo $_POST;

I get:

Array

I get nothing when I try this:

if ( $_POST ) {
    foreach ( $_POST as $key => $value ) {
        echo "llave: ".$key."- Valor:".$value."<br />";
    }
}

I get nothing when I try this:

$string = $_POST['operation'];
$var = json_decode($string);
echo $var;

I get NULL when I try this:

$data = json_decode( file_get_contents('php://input') );
var_dump( $data->operation );

When I do:

$data = json_decode(file_get_contents('php://input'), true);
var_dump($data);

I get:

NULL

The JSON format is (according to payment site documentation):

{
   "operacion": {
       "tok": "[generated token]",
       "shop_id": "12313",
       "respuesta": "S",
       "respuesta_details": "respuesta S",
       "extended_respuesta_description": "respuesta extendida",
       "moneda": "PYG",
       "monto": "10100.00",
       "authorization_number": "123456",
       "ticket_number": "123456789123456",
       "response_code": "00",
       "response_description": "Transacción aprobada.",
       "security_information": {
           "customer_ip": "123.123.123.123",
           "card_source": "I",
           "card_country": "Croacia",
           "version": "0.3",
           "risk_index": "0"
       }
    }
}

The payment site log says everything is OK. What’s the problem?

Answer 1

Try;

$data = json_decode(file_get_contents('php://input'), true);
print_r($data);
echo $data["operacion"];

From your json and your code, it looks like you have spelled the word operation correctly on your end, but it isn't in the json.

EDIT

Maybe also worth trying to echo the json string from php://input.

echo file_get_contents('php://input');