在php中抓取https json url [关闭]

Question

I have been using this code for the past 2-3 months to grab json data variables that are needed. When the url changes to https:// it errors out and won't display. Is there a different way to grab https from http for json url's and php? I can't seem to find anything in terms of a good example or documentation.

<?
$btcjsonurl = "http://blockchain.info/stats?format=json";
$btcjson = file_get_contents($btcjsonurl,0,null,null);
$btcdata = json_decode($btcjson, true);
$btcdiff = $btcdata['difficulty'];
echo $btcdiff;
?>

Answer 1

What's the error?

See this (possible dupe)

Unless, is there any reason why you can't use curl, or a similar php client?

Https requires extra client side implementation for SSL etc, whereas all file_get_contents, called without $opts, will do functionally is read a file stream. For example, if the hostname in the SSL certificate is not the one in the link you pass to file get contents, the implementation of https requires you- the client- to verify this (typically by looking up in a list of allowed host you would need to manually write). But because you're not working directly with a client, you have no opportunity to handle this.

Another route would be to use stream_context_create of course, but that's covered in the link above so I won't repeat it.

Hope this helps.