Parsing string from curl - php

Question

<?php
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => "",
//return the transfer as a string
CURLOPT_RETURNTRANSFER => true,
//enable headers
CURLOPT_HEADER => true,
//get only headers
CURLOPT_NOBODY => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => array(
"Accept: application/json",
"password: ",
"username: "
),
));
// $response contains the output string
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
print_r($response);
?>
I am trying to take $response and truncate data from it.My output of $response is
HTTP/1.1 200 OK Server: Apache-Coyote/1.1 access-token: a3581f021476e4fb406c6b7c79e4095cece5d0c6 token-expiration-hours: 24 Content-Type: application/json Content-Length: 0 Date: Tue, 21 Aug 2018 14:12:27 GMT
I would like $response to just be the value of the access-token
a3581f021476e4fb406c6b7c79e4095cece5d0c6

Answer 1

One option is to use regex to find the access token:
preg_match('/access-token: ([^\s]+) /', $response, $matches);
vaR_dump($matches[1]); //a3581f021476e4fb406c6b7c79e4095cece5d0c6
This will match any string after the string access-token, up to any whitespace. Just make sure the access-token is not the last item in the headers as there probably won't be any whitespace...
Assumption: the access token will never contain any white space.

Answer 2

Using this Regular Expression
(?<=access-token: )[a-z0-9]* you can get everything after 'access_token: ' until the next space:
<?php
$header = "HTTP/1.1 200 OK Server: Apache-Coyote/1.1 access-token: a3581f021476e4fb406c6b7c79e4095cece5d0c6 token-expiration-hours: 24 Content-Type: application/json Content-Length: 0 Date: Tue, 21 Aug 2018 14:12:27 GMT";
preg_match('/(?<=access-token: )[a-z0-9]*/', $header, $matches);
$access_token = $matches[0];
echo $access_token;

Answer 3

Another option is to explode by whitespace, find the key for 'access-token', and the value will be the next in the array:
$data = explode(' ', $response);
$key = array_search('access-token:', $data); //5
var_dump($data[$key + 1]); //a3581f021476e4fb406c6b7c79e4095cece5d0c6

Answer 4

Use regex like Inazo suggests as it's a better solution, but you can do:
$data = 'HTTP/1.1 200 OK Server: Apache-Coyote/1.1 access-token: a3581f021476e4fb406c6b7c79e4095cece5d0c6 token-expiration-hours: 24 Content-Type: application/json Content-Length: 0 Date: Tue, 21 Aug 2018 14:12:27 GMT';
$explodedData = explode("access-token: ", $data);
$explodedData2 = explode(" token-expiration-hours:", $explodedData[1]);
echo $explodedData2[0]; //contains access token.