How to send data as JSON in a cURL POST request in PHP?

To send data as JSON in a cURL POST request in PHP, you can follow the steps below:

Create an array or object containing the data you want to send as JSON.
Convert the array or object to JSON format using json_encode() function.
Set the Content-Type header to application/json to indicate that you are sending JSON data.
Set the CURLOPT_POSTFIELDS option of cURL to the JSON data.
Execute the cURL request.

Here's an example code snippet:

// Data to send as JSON
$data = [
    'name' => 'John',
    'email' => '[email protected]'
];

// Convert data to JSON format
$jsonData = json_encode($data);

// cURL initialization
$curl = curl_init();

// Set cURL options
curl_setopt($curl, CURLOPT_URL, 'https://example.com/api/endpoint');
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $jsonData);
curl_setopt($curl, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
]);

// Execute cURL request
$response = curl_exec($curl);

// Close cURL session
curl_close($curl);

// Handle response
if ($response === false) {
    // Failed cURL request
    echo 'Error: ' . curl_error($curl);
} else {
    // Successful cURL request
    echo 'Response: ' . $response;
}

Make sure to replace 'https://example.com/api/endpoint' with the actual endpoint URL you want to send the request to.