cURL variable empty

Question

I am using charts.js and trying to load data from a JSON API using cURL to pass to the chart. So I am using a PHP variable to pass to JavaScript. I did a test in ajax and it worked, but wanting to use cURL I cannot figure out the issue.

I created an if statement that it will print out nothing on an empty variable and that's what it has been doing, so I believe the issue is with cURL.

<?php 

$url = "https://api.coindesk.com/v1/bpi/historical/close.json?currency=btc";
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_HTTPHEADER, array('Accept: application/json'));
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$data = curl_exec($curl);

if(!empty($data)) {
   $data = $btc;
} else {
    print ("nothing");
}
curl_close($curl);


?>

<body>
      <canvas id="myChart" width="250px" height="250px"></canvas>
 <script>
     jsonData=<?php echo $btc ?>;
     var jsonLabels=[];
     var jsonValues=[];
     for(x in jsonData['bpi']){
         jsonLabels.push(x);
         jsonValues.push(jsonData['bpi'][x]);
     }

Where is `$btc` defined? Maybe you wanted `$btc = $data;` Also `var_dump($data);` — AbraCadaver, Apr 22 '19 at 20:21
$btc is defined if its not empty. I just wrote the statement to see where the error was. I tried var_dump and its returning false. — exception_thrown, Apr 22 '19 at 20:47
What does curl_getinfo() return after you've executed your request but before you close the connection? — , Apr 22 '19 at 20:54
Do you really have a newline between `Accept:` and `application/json`, or is that a copying error? — Barmar, Apr 22 '19 at 20:58
It really looks like you just have the assignment backwards, it should be `$btc = $data;`. — Barmar, Apr 22 '19 at 21:02
Are you sure you have `curl` enabled? When I try your code on my machine it works (after flipping the assignment), but when I try it on ideone.com I get `nothing`. I guess they block `curl`. — Barmar, Apr 22 '19 at 21:08
Change `print ("nothing");` to ` print ("nothing " . curl_error($curl));` so you see the reason why `curl` failed. On ideone.com it says "Could not resolve host: api.coindesk.com". — Barmar, Apr 22 '19 at 21:11
@Barmar Seems like its a ssl error, as my error when I did that was "SSL certificate problem: unable to get local issuer certificate" — exception_thrown, Apr 22 '19 at 21:15
See https://stackoverflow.com/questions/28858351/php-ssl-certificate-error-unable-to-get-local-issuer-certificate — Barmar, Apr 22 '19 at 21:16
it would probably be better if you fixed your certificate, as there may be other sites that require SSL. — Barmar, Apr 22 '19 at 21:28
@barmar yes I will, but at the moment this is hosted on a local server. When it goes live I will correct the ssl. — exception_thrown, Apr 23 '19 at 13:32

cURL variable empty

0 Answers0