The error message "Call to undefined function curl_init()" typically indicates that the cURL extension for PHP is not installed or is not enabled.
There are several possible reasons why cURL is returning a 0 length response when trying to connect to an HTTPS site.
The location of the curl installation depends on the operating system and the method used to install it.
It sounds like you are trying to use curl to make a request to an HTTPS url and are encountering an error that says "Cannot resolve host." This error can occur for a few reasons:
To pass a JSON object through cURL using the PUT method, you can use the following command:
Error 18 means that the transfer was closed with outstanding read data remaining.
This error message appears when curl is unable to verify the SSL/TLS certificate presented by the server.
This error is usually caused by a network issue, such as a lost connection or a network timeout.
To make a POST request with PHP's cURL functions, you can use the CURLOPT_POST option to send POST data.
To make a POST request using curl and include a header of Content-Type: application/x-www-form-urlencoded, you can use the following command: