PHP：如何从API调用解析JSON？

Question

I have a CURL response that looks like this:

{"page_number":2,"items":[],"items_per_page":1,"kind":"search#companies","total_results":0,"start_index":1} 

All i need from that is the value of "total_results":0

so I am trying to get "total_results" like this:

$url = "https://api.companieshouse.gov.uk/search/companies?q=POOdfgdfgyygfhfgfgfghgfP&items_per_page=1&start_index=0";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_USERPWD, "my_password");
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);

$output = curl_exec($ch);
$retcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$info = curl_getinfo($ch);
curl_close($ch);

echo $output->total_results[0];

However, when I echo the $output->total_results[0]; , I get nothing being echoed on my page. So i don't really know what I am doing wrong!

Could someone please advise on this issue?

any help would be appreciated.

Answer 1

What you got as a response is a JSON string. You can parse it to a stdClass object using json_decode :

$object = json_decode( $output );

Then you can access the field you want:

$total_results = $object->total_results;

Alternatively, you can parse the JSON string to an array:

$array = json_decode( $output, true );

and get the var:

$total_results = $array['total_results'];