My php gives "null" while it is something [duplicate] - php

Question

This question already has answers here:
How can I access an array/object?
(6 answers)
Closed 5 years ago.
So, I want to make my site check the bitcoin prices. I do that with virwox. So, I send a curl to http://api.virwox.com/api/json.php?method=getBestPrices&symbols[0]=BTC/SLL.
That gives me this:
{"result":[{"symbol":"BTC\/SLL","errorCode":"OK","bestBuyPrice":"983021","bestSellPrice":"1009989"}],"error":null,"id":""}
Now, I want the bestBuyPrice. So, I runned a json_decode on my $output. Then my $output is an array. So, I did json_encode("$output["result"]") to see what will come out of that. It gave me this:
[{"symbol":"BTC\/SLL","errorCode":"OK","bestBuyPrice":"983021","bestSellPrice":"1009989"}]
So, I tought if I do json_decode("$output["bestBuyPrice"]") I would get it, but I didn't. What I got was: null. How can I fix this?
Here is my full code:
<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://api.virwox.com/api/json.php?method=getBestPrices&symbols[0]=BTC/SLL");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
curl_close($ch);
$decode = json_decode($output, true);
$encode = json_encode($decode["result"]["bestBuyPrice"], true);
echo $encode; // Gives null
$koop = $decode["result"]["bestBuyPrice"]; // No result
$verkoop = $decode["result"]["bestSellPrice"]; // No result
echo $koop . "<br />".$verkoop;
?>
Thanks!

Answer 1

This one's real easy. Get rid of the quotes from around your variable!
json_encode("$output["result"]")
to
json_encode($output["result"])
EDIT:
Based on the var_dump in the comment below, it looks like there is another array key you need:
$koop = $decode["result"][0]["bestBuyPrice"];
Give that a try!