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Editorial Team
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Asked: 2026-06-18T20:51:04+00:00

I’m trying to get the json data from the following url: https://chart.googleapis.com/chart?cht=gv&chl=digraph framework {

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I’m trying to get the json data from the following url:

https://chart.googleapis.com/chart?cht=gv&chl=digraph framework { 1[color=red]; 2; 3[color=red]; 4; 5; 6; 7; 8; 9; 10; 11; 12[color=red]; 13; 14[color=red]; 15; 16[color=red]; 17[color=red]; 2 -> 1; 3 -> 1; 4 -> 1; 5 -> 1; 6 -> 2; 8 -> 9; 9 -> 8; 12 -> 2; 12 -> 3; 12 -> 4; 12 -> 5; 7 -> 6; 7 -> 10; 7 -> 11; 8 -> 7; 13 -> 5; 14 -> 13; 15 -> 6; 16 -> 15; 17 -> 12; 10 -> 4; 11 -> 3; 14 -> 16; 16 -> 17; }&chof=json

I have tried several methods that were suggested in other questions:

$jsonurl = "https://chart.googleapis.com/chart?cht=gv&chl=digraph framework { 1[color=red]; 2; 3[color=red]; 4; 5; 6; 7; 8; 9; 10; 11; 12[color=red]; 13; 14[color=red]; 15; 16[color=red]; 17[color=red]; 2 -> 1; 3 -> 1; 4 -> 1; 5 -> 1; 6 -> 2; 8 -> 9; 9 -> 8; 12 -> 2; 12 -> 3; 12 -> 4; 12 -> 5; 7 -> 6; 7 -> 10; 7 -> 11; 8 -> 7; 13 -> 5; 14 -> 13; 15 -> 6; 16 -> 15; 17 -> 12; 10 -> 4; 11 -> 3; 14 -> 16; 16 -> 17; }&chof=json"

//Method 1
$json = file_get_contents($jsonurl); 
// returns an error from the google page: 400. That’s an error. Your client has issued a malformed or illegal request. That’s all we know

//Method 2
$curlSession = curl_init();
 curl_setopt($curlSession, CURLOPT_URL, $jsonurl);
 curl_setopt($curlSession, CURLOPT_BINARYTRANSFER, true);
 curl_setopt($curlSession, CURLOPT_RETURNTRANSFER, true);

 $json_decoded = json_decode(curl_exec($curlSession));
 curl_close($curlSession);
 // returns NULL
 // This makes sense if the JSON isn't not returned correctly. I think json_decode() returns NULL if the input is not correct json data.

 //Method 3
 $json = file_get_contents(urlencode($jsonurl));
 // Gives another error: [function.file-get-contents]: failed to open stream: File name too long

If I just post the raw JSON data in my code the rest of my algorithm works fine. The point is, in my actual code the url is dynamic and I need to be able to get the JSON data from the url.

It seems like an security issue with google. However, I don’t have a clue as of how to solve this.

This is my first question on Stackoverflow. Please let me know if you want to know more/if I should edit my question somehow.

Thanks in advance!

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1 Answer

  1. Editorial Team

    Your URL needs to be URI-escaped for cURL to use it properly. If I change your script to this:

    # note that in this string, all special characters (eg. spaces) are %-escaped
$jsonurl = "https://chart.googleapis.com/chart?cht=gv&chl=digraph%20framework%20{%201[color=red];%202;%203[color=red];%204;%205;%206;%207;%208;%209;%2010;%2011;%2012[color=red];%2013;%2014[color=red];%2015;%2016[color=red];%2017[color=red];%202%20-%3E%201;%203%20-%3E%201;%204%20-%3E%201;%205%20-%3E%201;%206%20-%3E%202;%208%20-%3E%209;%209%20-%3E%208;%2012%20-%3E%202;%2012%20-%3E%203;%2012%20-%3E%204;%2012%20-%3E%205;%207%20-%3E%206;%207%20-%3E%2010;%207%20-%3E%2011;%208%20-%3E%207;%2013%20-%3E%205;%2014%20-%3E%2013;%2015%20-%3E%206;%2016%20-%3E%2015;%2017%20-%3E%2012;%2010%20-%3E%204;%2011%20-%3E%203;%2014%20-%3E%2016;%2016%20-%3E%2017;%20}&chof=json";

# your settings here are fine
$curlSession = curl_init();
curl_setopt($curlSession, CURLOPT_URL, $jsonurl);
curl_setopt($curlSession, CURLOPT_BINARYTRANSFER, true);
curl_setopt($curlSession, CURLOPT_RETURNTRANSFER, true);

# XXX: not entirely safe here
# curl_exec() could dump out something other than JSON if it encounters an error
# I recommend saving the output of curl_exec($c) separately in case of error
$json = json_decode(curl_exec($c));

    Then $json contains the data object I would expect. I tested this in PHP 5.3.15 on a Mac.

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