curl not working but not giving any error either - php

Question

I'm working on Globe Labs API to send an SMS. But before I can send an SMS, the mobile number I want to send message to needs to be subscribed so I can get the access_token which will be used in sending SMS.
There are 2 options to subscribe - via SMS or via Web Form. I was able to use first option without any problem. But I can't make the second option work.
According to the documentation, after the subscriber keyed-in the received confirmation pin on the page and clicked the Confirm button to authorize the subscriber, the page will then be redirected to the redirect_uri of my application, and a Code parameter will be passed(via GET) to it.
Here's the part where I fail to make it work:
To get the access token, you need to do a POST request via https://developer.globelabs.com.ph/oauth/access_token with your ‘app_id’, ‘app_secret’ and ‘code’ as the parameters. The parameters ‘access_token’ and ‘subscriber_number’ will then be returned to your Redirect URI as a response.
Here's my code:
$app_id = '<my_app_id>';
$app_secret = '<my_app_secret>';
$content = array(
'app_id' => $app_id,
'app_secret' => $app_secret,
'code' => $this->input->get('code')
);
$url = 'http://developer.globelabs.com.ph/oauth/access_token';
$this->post_to_url($url, $content);
function post_to_url($url, $data) {
$fields = '';
foreach($data as $key => $value) {
$fields .= $key . '=' . $value . '&';
}
rtrim($fields, '&');
$post = curl_init();
curl_setopt($post, CURLOPT_URL, $url);
curl_setopt($post, CURLOPT_POST, count($data));
curl_setopt($post, CURLOPT_POSTFIELDS, $fields);
curl_setopt($post, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($post);
curl_close($post);
if(!$result){
die('Error: "' . curl_error($post) . '" - Code: ' . curl_errno($post));
} else {
$this->Sms_Api_model->save_subscriber_data();
}
}
This is my redirect URL: http://api.forexcargo.us/sms_api/globelabs_api?code=[code]
And the result I get:
Error: "" - Code:
EDIT:
I tried to use a form and send my data via method POST and it worked. So it really might be my curl setup.
What am I doing wrong?
Any help is highly appreciated. Thank you!

Answer 1

Apologies for being a newbie regarding curl. Apparently, I had to add the following code to see the errors on my code because the URL I'm using has its error checking disabled:
error_reporting(-1);
ini_set('display_errors', 1);
set_time_limit(0);
And my new code:
function do_post_request($post_data)
{
error_reporting(-1);
ini_set('display_errors', 1);
set_time_limit(0);
$url = 'https://developer.globelabs.com.ph/oauth/access_token';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
// execute!
$response = curl_exec($ch);
// close the connection, release resources used
curl_close($ch);
// do anything you want with your response
if($this->json_validator($response) == 1){
$decode_data = json_decode($response, true);
$post_data_arr = array('access_token' => $decode_data['access_token'], 'subscriber_number' => $decode_data['subscriber_number']);
$this->Sms_Api_model->save_subscriber_data($post_data_arr);
//var_dump(http_response_code(200));
}
}
$content = [
'app_id' => $app_id,
'app_secret' => $app_secret,
'code' => $this->input->get('code')
];
$post_request = $this->do_post_request($content);
Now it's working and I was able to save the data I received in my database. Thank you everyone for your help!