What does (-X,-H,-d) mean for this command (Curl -X POST -H "Content-Type: application/json" -d) and how to do it for the php file?

Question

curl -X POST -H "Content-Type: application/json" -d

I need to do this command and send a JSON to a certain API that will return a response but I don’t know how the structure of this would look in a PHP file and what this data means (-X -H -d). I’ve seen it look like that when we do the remote cmd.

Answer 1

curl -X POST -H "Content-Type: application/json" -d

According to the documentation:

• -X: Specifies the request method (GET, HEAD, POST or PUT) to use when communicating with the server.

• -H: Indicates that a Header extra will be included in the request.

• -d: Send the data specified in a request POST to the server.

In PHP it would look something like this:

$curl = curl_init();
$url = "URL";

curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_HEADER, 1);
curl_setopt($curl, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));

curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

$resultado = curl_exec($curl);
curl_close($curl);

print_r($resultado);

If you want to send more data in this request, you need to use the function json_encode() to code them properly. See an example:

$foo = "foo";
$bar = "bar";

$dadosJson = json_encode(array( "foo"=> $foo, "bar" => $bar));
curl_setopt($curl, CURLOPT_POSTFIELDS, $dadosJson);