uploading file to dropbox using V2 in custom PHP - php

Question

I have written code for file uploading and it is working fine on one server but not on local machine. Following is code:
<?php
ini_set("display_errors",1);
$api_url = 'https://content.dropboxapi.com/2/files/upload'; //dropbox api url
$token = 'fxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
$headers = array('Authorization: Bearer ' . $token,
'Content-Type: application/octet-stream',
'Dropbox-API-Arg: ' .
json_encode(
array(
"path" => '/' . basename('image/1st.jpg'),
"mode" => "add",
"autorename" => true,
"mute" => false
)
),
'Content-Type: application/octet-stream'
);
$ch = curl_init($api_url);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POST, true);
$path = 'images/1st.jpg';
$fp = fopen($path, 'rb');
$filesize = filesize($path);
curl_setopt($ch, CURLOPT_POSTFIELDS, fread($fp, $filesize));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_VERBOSE, 1); // debug
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo "<pre>response === "; print_r($response); echo "</pre>";
echo "<pre>http_code === "; print_r($http_code); echo "</pre>";
?>
When i run this code on local, i got following output:
response ===
http_code === 0
On test server, it produce following output:
{"name": "1st.jpg", "path_lower": "/1st.jpg", "path_display": "/1st.jpg", "id": "id:UDbOKdE2bKXXXXXXECg", "client_modified": "2017-10-10T10:05:11Z", "server_modified": "2017-10-10T10:05:11Z", "rev": "4075316e33a", "size": 143578, "content_hash": "f30041XXXXXXXXXXX35ee3cXXXXXXe649afe8d"}
200
what can be possible reason for this issue?

Answer 1

Try to disable SSL veryfy host:
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
Or more correct way is:
Download a file with the updated list of certificates from https://curl.haxx.se/ca/cacert.pem
Move the downloaded cacert.pem file to some safe location in your system
Update your php.ini file and configure the path to that file:
; Linux and macOS systems
curl.cainfo = "/path/to/cacert.pem"
; Windows systems
curl.cainfo = "C:\path\to\cacert.pem"

Answer 2

Following steps resolved issue for me:
1) Download the latest cacert.pem from https://curl.haxx.se/ca/cacert.pem
2) Add the following line to php.ini