pingpoliSliderCaptcha_usage2.html

<?php
if ( $_SERVER['REQUEST_METHOD'] == "POST" )
{
    // check captcha
    $xPos = $_POST['xPos'] ?? false;
    $yPos = $_POST['yPos'] ?? false;
    $sessionXPos = $_SESSION['captcha_x'] ?? false;
    $sessionYPos = $_SESSION['captcha_y'] ?? false;
    $xError = abs( $sessionXPos - $xPos );
    $yError = abs( $sessionYPos - $yPos );
    if ( $xPos !== false && $yPos !== false && $sessionXPos !== false && $sessionYPos !== false && $xError < 0.0001 && $yError < 0.0001 )
    {
        // process the contact request ...
    }
}
?>