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(<form method="post" ...)

<?php session_start(); ?>
<?php require("botdetect.php"); ?>

<link type="text/css" rel="Stylesheet" 
    href="<?php echo CaptchaUrls::LayoutStylesheetUrl() ?>" />
</head>

  […]

<?php // Adding BotDetect Captcha to the page 
  $ExampleCaptcha = new Captcha("ExampleCaptcha");
  $ExampleCaptcha->UserInputID = "CaptchaCode";
  echo $ExampleCaptcha->Html(); 
?>

<input name="CaptchaCode" id="CaptchaCode" type="text" />

<?php 
  if ($_POST) {
    // validate the Captcha to check we're not dealing with a bot
    $isHuman = $ExampleCaptcha->Validate();
    
    if (!$isHuman) {
      // TODO: Captcha validation failed, show error message
    } else {
      // TODO: Captcha validation passed, perform protected action
    } 
  }
?>