Getting a single value from an array - php

Question

I am getting a response as an array in the following format:
Array
(
[refresh_token_expires_in": "0] =>
[api_product_list": "[ops-prod]] =>
[api_product_list_json": [
"ops-prod"
]] =>
[organization_name": "epo] =>
[developer.email": "sudham#gmail.com] =>
[token_type": "BearerToken] =>
[issued_at": "1568870621501] =>
[client_id": "F4GzALmoCfWXh] =>
[access_token": "MYjtqSlOI] =>
[application_name": "8ec0-872fa20cdc59] =>
[scope": "core] =>
[expires_in": "1199] =>
[refresh_count": "0] =>
[status": "approved] =>
[error] =>
)
when i run print_r($token); i am getting the proper response.
Now i need to grab the value of only "access_token". I am not sure how to do that. I tried with $token['access_token']; but its returning null value. Can anyone help me on the same.
The following is the json response:
{"refresh_token_expires_in\": \"0":"","api_product_list\": \"[ops-prod]":"","api_product_list_json\": [\n \"ops-prod\"\n ]":"","organization_name\": \"epo":"","developer.email\": \"sudham#gmail.com":"","token_type\": \"BearerToken":"","issued_at\": \"1568871637352":"","client_id\": \"fxhYBIrh7BZHtcQeUIGF4GzALmoCfWXh":"","access_token\": \"HgARGtASwbcG":"","application_name\": \"2df9fbac-8ec0-872fa20cdc59":"","scope\": \"core":"","expires_in\": \"1199":"","refresh_count\": \"0":"","status\": \"approved":"","error":""}
Response
a:14:{s:29:"refresh_token_expires_in": "0";s:0:"";s:30:"api_product_list": "[ops-prod]";s:0:"";s:44:"api_product_list_json": [
"ops-prod"
]";s:0:"";s:24:"organization_name": "epo";s:0:"";s:39:"developer.email": "sudham#gmail.com";s:0:"";s:25:"token_type": "BearerToken";s:0:"";s:26:"issued_at": "1568871637352";s:0:"";s:45:"client_id": "4GzALmoCfWXh";s:0:"";s:44:"access_token": "ARGtASwbcG";s:0:"";s:56:"application_name": "46e2-8ec0-872fa20cdc59";s:0:"";s:13:"scope": "core";s:0:"";s:18:"expires_in": "1199";s:0:"";s:18:"refresh_count": "0";s:0:"";s:18:"status": "approved";s:0:"";}
oauth1.php
<?php
function read_token ($tokenname) {
// read token file and return token variables array
// if token not present or outdated create a new token and return new token variables array
$tokenfile="$tokenname.dat";
$error='';
if (file_exists($tokenfile)) {
$token=unserialize(file_get_contents($tokenfile));
// convert token issued time from windows (milliseconds) format to unix (seconds) format
$tokentime=substr($token['issued_at'],0,-3);
$tokenduration=$tokentime + $token['expires_in'] - 120;
if ($tokenduration < time()) {
$error.="token '$tokenname' expired.<br>\n";
} else {
$token['error']=$error;
}
} else {
$error.="tokenfile '$tokenname' not found.<br>\n";
}
if ($error) {$token=create_token($tokenname);}
return($token);
}
function create_token ($tokenname) {
// set variables
$tokenfile="$tokenname.dat";
$error='';
switch ($tokenname) {
case 'OPSincidental':
$ops_key='*******';
$ops_secret='*******';
break;
default:
$ops_key='*******';
$ops_secret='*******';
break;
}
$tokenUrl='https://ops.epo.org/3.2/auth/accesstoken';
$tokenHeaders=array(
'Authorization: Basic '.base64_encode($ops_key.':'.$ops_secret),
'Content-Type: application/x-www-form-urlencoded'
);
$tokenPostFields='grant_type=client_credentials';
$curlOpts=array(
CURLOPT_URL => $tokenUrl,
CURLOPT_HTTPHEADER => $tokenHeaders,
CURLOPT_POSTFIELDS => $tokenPostFields,
CURLOPT_POST => 1,
CURLOPT_RETURNTRANSFER => 1
);
// obtain token
$token_request= curl_init();
curl_setopt_array($token_request, $curlOpts);
if (!$ops_token_response=curl_exec($token_request)) {$error.=curl_error($token_request)."<br>\n";}
curl_close($token_request);
// process token
$ops_token_split=explode(',', trim($ops_token_response,'{}'));
foreach ($ops_token_split as $tokenval) {
$tokenpair=explode(' : ', trim($tokenval));
$token[trim($tokenpair[0],'"')]=trim($tokenpair[1],'"');
}
// write token data to file
file_put_contents($tokenfile, serialize($token));
// add error information to token array and return result
$token['error']=$error;
return($token);
}
?>
oauthmain.php
<?php
// obtain token
include_once('oauth1.php');
$token=read_token('OPSincidental');
//print json_encode($token);
if (!$token['error']) {
echo "Token:<br>\n<PRE>"; print_r($token); echo "</PRE>";
// prepare for sending data request
$error='';
$requestUrl='http://ops.epo.org/3.2/rest-services/published-data/publication/epodoc/EP1000000/biblio';
//$requestUrl='https://ops.epo.org/3.2/rest-services/published-data/publication/epodoc/EP100000';
$requestHeaders=array(
'Authorization: Bearer '.$token['access_token'],
'Host: ops.epo.org',
'X-Target-URI: http://ops.epo.org',
'Accept: application/xml',
'Connection: Keep-Alive'
);
$curlOpts=array(
CURLOPT_URL => $requestUrl,
CURLOPT_HTTPHEADER => $requestHeaders,
// CURLOPT_SSL_VERIFYPEER => FALSE,
// CURLOPT_SSL_VERIFYHOST => FALSE,
CURLOPT_RETURNTRANSFER => 1,
CURLOPT_HEADER => 1
);
// send request and collect data
$ops_request= curl_init();
curl_setopt_array($ops_request, $curlOpts);
if (!$ops_response=curl_exec($ops_request)) { $error.=curl_error($ops_request)."<br>\n";}
echo "curl options:<br>\n";
echo "<PRE>";print_r($requestHeaders);echo "</PRE>";
curl_close($ops_request);
if ($error) {echo "Error:<br>\n$error";} else {echo "Result:<br>\n".htmlspecialchars($ops_response);}
} else {
echo $token['error'];
}
?>

Answer 1

Use the unserialize() function to parse that response.
$ops_token_response = file_get_contents("filename.dat");
$token = unserialize($ops_token_response);
echo $token['access_token'];

Answer 2

TBH I would recommend changing the way you store the token file - I would store the return value from the API directly to the file (you would be storing the JSON string). At the moment you are trying to do your own json_decode() on the response - which is not correctly extracting the data anyway...
// Do not use this bit
// process token
// $ops_token_split=explode(',', trim($ops_token_response,'{}'));
// foreach ($ops_token_split as $tokenval) {
// $tokenpair=explode(' : ', trim($tokenval));
// $token[trim($tokenpair[0],'"')]=trim($tokenpair[1],'"');
// }
// Decode the values to $token
$token = json_decode($ops_token_split, true);
// Write JSON to token file
// write token data to file
file_put_contents($tokenfile, $ops_token_response);
Then to read the file, just json_decode() the contents of the file...
if (file_exists($tokenfile)) {
$token=json_decode(file_get_contents($tokenfile), true);