My php gives "null" while it is something

Question

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!

Why do you decode and then encode and then decode again…?! — deceze, Sep 14 '17 at 08:48
@Shinratensei Sorry, I writed it wrong at my question. But in my code it is alright. No quetos still the same thing... — Aaron Jonk, Sep 14 '17 at 09:04
`result` is an array! It has keys `0`, `1` etc, not `bestBuyPrice`. — deceze, Sep 14 '17 at 09:11

delboy1978uk · Accepted Answer · 2017-09-14T09:19:20.317

0

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!

edited Sep 14 '17 at 09:19

answered Sep 14 '17 at 08:45

delboy1978uk

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That should really result in a syntax error to begin with, not `null`… – deceze Sep 14 '17 at 08:50
I didn't do that in my own code. I did it in my question wrong... – Aaron Jonk Sep 14 '17 at 09:04
What does `var_dump($decode);` give you? – delboy1978uk Sep 14 '17 at 09:11
That gives me this: `array(3) { ["result"]=> array(1) { [0]=> array(4) { ["symbol"]=> string(7) "BTC/SLL" ["errorCode"]=> string(2) "OK" ["bestBuyPrice"]=> string(6) "989000" ["bestSellPrice"]=> string(6) "996499" } } ["error"]=> NULL ["id"]=> string(0) "" }` – Aaron Jonk Sep 14 '17 at 09:15
edited my answer, give it a try – delboy1978uk Sep 14 '17 at 09:19
@delboy1978uk Thanks! – Aaron Jonk Sep 14 '17 at 10:16

My php gives "null" while it is something

1 Answers1