json - Returning empty variables in PHP using Facebook Graph -

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i trying retrieve data json feed , display using php. issue elements return empty. have in loop want return each post, not have picture, message or comments , comes notice: undefined variable. (i trying retrieve data fb group)

here settings

<?php // settings   $groupid = "231809390188650"; $accesstoken = "mytokengoeshere";  // request , parse json $json_string = file_get_contents("https://graph.facebook.com/$groupid/feed?    access_token=$accesstoken"); $parsed_json = json_decode($json_string);  ($i = 0; $i < $json_string; $i++)   {  // returned data  $gimage = $parsed_json->data[i]->picture; $gmessage = $parsed_json->data[i]->message; $gcreated_time = $parsed_json->data[i]->created_time; $gupdated_time = $parsed_json->data[i]->updated_time; $gcomments_message = $parsed_json->data[i]->comments->data[i]->message; }; ?>

here output (rough example)

<h1> facebook group </h1> <?php  echo "image url : " , $gimage; echo "message : " , $gmessage; echo "date posted : " , $gcreated_time; echo "updated @ : " , $gupdated_time; echo "comments: ", $gcomments_message;  ?>

with notice: undefined variable: gimage etc each one. i'm not sure why happening. here example of json feed shows not elements have in them. http://pastebin.com/eujce5vt

the problem elements not exist, , have e_strict error reporting turned on in php (which helps spot issues).

thus, need make sure variables set before trying output them. also, make sure access variables with $ prefix. might this: 

for ($i = 0; $i < $json_string; $i++)   {     $gimage = $parsed_json->data[$i]->picture;     $gmessage = $parsed_json->data[$i]->message;     $gcreated_time = $parsed_json->data[$i]->created_time;     $gupdated_time = $parsed_json->data[$i]->updated_time;       if (isset($gimage))         echo "image url : " , $gimage;     if (isset($gmessage))         echo "message : " , $gmessage;     if (isset($gcreated_time))         echo "date posted : " , $gcreated_time;     if (isset($gupdated_time))         echo "updated @ : " , $gupdated_time;  }

please note removed comments variable. you'll need separate loop inside first 1 access comments.


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