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Checking if given IP address is behind TOR in PHP using free API:

<?php
$ip = '123.45.67.89'; //IP of the visitor
$data = json_decode(file_get_contents('http://api.rest7.com/v1/detect_tor.php?ip=' . $ip));

if (@$data->success !== 1)
{
    die('Failed');
}
if ($data->is_tor)
{
    echo 'Visitor is using TOR';
}
else
{
    echo 'Visitor is not using TOR';
}