如何使用php获取数组的特定内容（？）？

So I think I have an array containing a lot of data from an API (might be json though but I'm not sure : https://bitebtc.com/api/v1/market), and I want to extract some specific data such as the 'percent'.

I tried 3 ways relatively similare using json_decode() method but nothing worked :/ Here's one of them:

<?php
  $string = "https://bitebtc.com/api/v1/market";
  $decoded = file_get_contents($string);
  $percent = $decoded->percent;
  echo $percent;

As you can see in the link, the expected output would be something like 1.3 or at least a floating number between 0 and 10, but I got nothing, or a php notice: Trying to get property of non-object; since it is not an error I guess the problem doesn't come from the non-object property thing...

Visit the docs for file_get_contents() for information on how to pass the header (Content-Type: application/json) that this api requires.

curl -X GET 'https://bitebtc.com/api/v1/markets' -H 'Content-Type: application/json'

This probably makes quite a bit of difference in what you get back(!)... Using the sample code from the docs to apply to your situation, we come up with something like this:

<?php
// Create a stream
$opts = array(
  'http'=>array(
    'method'=>"GET",
    'header'=>"Content-Type: application/json
"
  )
);

$context = stream_context_create($opts);

// Open the file using the HTTP headers set above
$file = file_get_contents('https://bitebtc.com/api/v1/markets', false, $context);

// now print out the results so you can see what you're working with (should be a huge JSON string)
print $file;

// decode it and var dump it to see how to work with it
$decoded = json_decode($file);
var_dump($decoded);

?>

You may have to work with this example; I'm not on a computer with PHP installed to test it...