Unable to decode json object using php?

Question

I am trying to read a json object that is sent from a Rest Api call. However, i get a notice saying Undefined index. Is there anything i am missing ?

Notice: Undefined index subnet line 7

php

$response = file_get_contents('https://xyz:[email protected]/rest/v3/SoftLayer_Account/IpAddresses.json'); 

$data = json_decode($response,true);

echo "Gateway: ".$data["subnet"][0]["gateway"];
echo "NetMask: ".$data["subnet"][0]["netmask"];

echo "Done";
?>

IpAddresses.json

[
   {
      "id":12345,
      "subnet":{
         "netmask":"255.255.255.255",
         "gateway":"192.168.255.255"
      }
   },
   {
      "id":56789,
      "subnet":{
         "netmask":"255.255.255.255",
         "gateway":"192.168.255.255"
      }
   }
]

John Conde · Accepted Answer · 2014-09-23 19:43:54Z

2

You're close:

echo "Gateway: ".$data[0]["subnet"]["gateway"];
echo "NetMask: ".$data[0]["subnet"]["netmask"];

Write it like you read it: you want the first item's subnet netmask and gateway.

                                 ^      ^          ^ 
                                [0] ['subnet'] ['netmask']

answered Sep 23, 2014 at 19:43

John Conde

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2 Comments

user3846091 Over a year ago

thank you .. is it possible to determine the number of items in $data ? I was planning to run a for loop ? example $data[n]["subnet"]["gateway"] wondering hwo to determine the n ?

John Conde Over a year ago

Sure. It's just a normal numerically keyed multidimensional array. count() and for loops work just fine. (As do foreach loops).

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