How can I effectively use CURLOPT in PHP to interact with CGI in order to extract data from my Speedport LTE2 router?

To interact with CGI in PHP using cURL, you can use the CURLOPT_POSTFIELDS option to send data to the CGI script and CURLOPT_RETURNTRANSFER option to retrieve the response. You can then parse the response to extract the data you need from your Speedport LTE2 router.

<?php
$ch = curl_init();

$url = 'http://your-router-ip/cgi-bin/your-cgi-script';
$data = array(
    'param1' => 'value1',
    'param2' => 'value2'
);

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($ch);

if($response === false){
    echo 'Error: ' . curl_error($ch);
} else {
    // Parse $response to extract the data you need
    echo $response;
}

curl_close($ch);
?>