How to Send JSON Data with cURL in PHP Using PUT, POST, GET, and DELETE?

cURL in PHP: Passing JSON Data via PUT, POST, GET

In REST API development, cURL is a valuable tool for testing and communicating with remote servers. This article demonstrates how to pass JSON data through cURL using four common HTTP methods: PUT, POST, GET, and DELETE.

PUT

This method allows you to update a resource. The following PHP code sample shows how to send JSON data in a PUT request:

<?php $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

POST is used to create a new resource. The PHP code below showcases how to send JSON data with a POST request:

<?php $ch = curl_init();
curl_setopt($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

GET is designed to retrieve resources. Since JSON data cannot be appended to a URL, you must encode it and pass it as a query string parameter. Refer to @Dan H's answer for a working example of sending JSON data with a GET request.

DELETE

The DELETE method removes a resource from the server. The following PHP code demonstrates how to perform a DELETE operation with JSON data:

<?php $ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "DELETE");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);
?>

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