Get Header from PHP cURL response

I am new to PHP. I am trying to get the Header from the response after sending the php curl POST request. The client sends the request to the server and server sends back the response with Header. Here is how I sent my POST request.

   $client = curl_init($url);  
   curl_setopt($client, CURLOPT_CUSTOMREQUEST, "POST");
   curl_setopt($client, CURLOPT_POSTFIELDS, $data_string);
   curl_setopt($client, CURLOPT_HEADER, 1);
   $response = curl_exec($client);
   var_dump($response);

Here is the Header response from server that I get from the browser

HTTP/1.1 200 OK 
Date: Wed, 01 Feb 2017 11:40:59 GMT 
Authorization: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1c2Vycy9CYW9CaW5oMTEwMiIsIm5hbWUiOiJhZG1pbiIsInBhc3N3b3JkIjoiMTIzNCJ9.kIGghbKQtMowjUZ6g62KirdfDUA_HtmW-wjqc3ROXjc Content-Type: text/html;charset=utf-8 Transfer-Encoding: chunked Server: Jetty(9.3.6.v20151106) 

How can I extract the Authorization part from the Header ?. I need to store it in the cookies

---

它将所有标题转换为数组

// create curl resource
$ch = curl_init();

// set url
curl_setopt($ch, CURLOPT_URL, "example.com");

//return the transfer as a string
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
//enable headers
curl_setopt($ch, CURLOPT_HEADER, 1);
//get only headers
curl_setopt($ch, CURLOPT_NOBODY, 1);
// $output contains the output string
$output = curl_exec($ch);

// close curl resource to free up system resources
curl_close($ch);

$headers = [];
$data = explode("n",$output);
$headers['status'] = $data[0];
array_shift($data);

foreach($data as $part){
    $middle=explode(":",$part);
    $headers[trim($middle[0])] = trim($middle[1]);
}

// Print all headers as array
echo "<pre>";
print_r($headers);
echo "</pre>";

---

You just include this coding into your curl request

curl_setopt($curl_exec, CURLOPT_HEADER, true); 
curl_setopt($curl_exec, CURLOPT_NOBODY, true);

after your curl execution use $header_data= curl_getinfo($curl_exec);

Then you get all the headers

print_r($header_data);

or use the shell_exec

echo shell_exec("curl -I http://example.com ");

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