How can POST data be correctly transferred to an external link within a frame in PHP?

When transferring POST data to an external link within a frame in PHP, you can use cURL to send a POST request to the external link with the POST data. This allows you to transfer the data securely and efficiently.

<?php
// POST data to be transferred
$postData = array(
    'key1' => 'value1',
    'key2' => 'value2'
);

// External link within a frame
$externalLink = 'https://example.com';

// Initialize cURL session
$ch = curl_init();

// Set cURL options
curl_setopt($ch, CURLOPT_URL, $externalLink);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postData));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

// Execute cURL session
$response = curl_exec($ch);

// Close cURL session
curl_close($ch);

// Output the response
echo $response;
?>