How to Send JSON Data with Curl and PHP using PUT, POST, and GET?

Curl and PHP: Passing JSON Data via PUT, POST, and GET

When using curl in PHP to interact with a REST API, JSON data can be transmitted through three common HTTP request methods: PUT, POST, and GET. This article provides a detailed guide on how to achieve these data transfers effectively.

PUT

To perform a PUT request with a JSON payload, follow these steps:

$data = array('username' => 'dog', 'password' => 'tall');
$data_json = json_encode($data);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json','Content-Length: ' . strlen($data_json)));
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
curl_setopt($ch, CURLOPT_POSTFIELDS,$data_json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response  = curl_exec($ch);
curl_close($ch);

POST

For a POST request with JSON data, use this code:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,$data_json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response  = curl_exec($ch);
curl_close($ch);

GET

As outlined in @Dan H's response, you can incorporate JSON data into a GET request by appending it to the URL as a query string:

$url .= '?data=' . urlencode(json_encode($data));

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response  = curl_exec($ch);
curl_close($ch);

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