spam filter for contact-form.php doesnt work

I am trying in vain to include SPAM protection in the contact form … Can someone help me with this? It’s just getting worse with the spam messages! Google Recaptcha does not work … the checkout field is displayed, but no matter whether it is confirmed or not, the messages go out. Unfortunately, this is also the case with other plugins. In principle, a "simple" // "invisible" query would be enough for me. Most bots should fall for it … But I just don’t get it involved. I uploaded the original_code to github. Below is a file with "invisible" spam protection ….

https://gist.github.com/MrThiemann/3ce76269340acf52c6b5526e5bff0c3e

/* ........................................................... Template Name: Kontaktformular * * * @file           contact-form.php * @filesource     wp-content/themes/handwerk/contact-form.php ............................................................ */ ?>  <?php  $  data = get_option('bo_options'); $  response = isset( $  data['contact']['bo_contact_response'] ) ? $  data['contact']['bo_contact_response'] : null; $  recipient = isset( $  data['contact']['bo_formmail_address'] ) ? $  data['contact']['bo_formmail_address'] : null; $  shdata = isset( $  data['contact']['bo_show_dataprot'] ) ? $  data['contact']['bo_show_dataprot'] : null; $  datalink = isset( $  data['contact']['bo_dataprot_page_url'] ) ? $  data['contact']['bo_dataprot_page_url'] : null; $  bloginfo = get_bloginfo('admin_email'); if ($  recipient == '') { $  rec = $  bloginfo; } else { $  rec = $  recipient; } $  sub = isset( $  data['contact']['bo_formmail_subject'] ) ? $  data['contact']['bo_formmail_subject'] : null; $  offerinfo = isset( $  data['contact']['bo_offer_info_text'] ) ? $  data['contact']['bo_offer_info_text'] : null;  if(isset($  _POST['submitted'])) {     if(trim($  _POST['checking']) !== '') {         $  captchaError = true;     } else {         if(trim($  _POST['contactName']) === '') {             $  nameError = __('Bitte tragen Sie Ihren Namen ein','bobox');             $  hasError = true;         } else {             $  name = trim($  _POST['contactName']);         }         $  phone = trim($  _POST['phone']);             $  subject = trim($  _POST['subject']);             if(isset($  _POST['objectName'])) {                 $  objectname = trim($  _POST['objectName']);             }         if(trim($  _POST['email']) === '')  {             $  emailError = __('Sie haben vergessen, eine E-Mail Adresse einzutragen');             $  hasError = true;         } else if (filter_var(trim($  _POST['email']), FILTER_VALIDATE_EMAIL))  {         $  email = trim($  _POST['email']);          } else {             $  emailError = __('Sie haben eine ungültige E-Mail Adresse eingetragen');             $  hasError = true;         }                  if(trim($  _POST['comments']) === '') {             $  commentError = 'Sie haben vergessen, eine Nachricht einzutragen';             $  hasError = true;         } else {             if(function_exists('stripslashes')) {                 $  comments = stripslashes(trim($  _POST['comments']));             } else {                 $  comments = trim($  _POST['comments']);             }         }         if(!isset($  hasError)) {              $  emailTo = $  rec;             $  msubject = $  sub;             $  body = " \n\nEine Anfrage zum Thema: $  objectname  \nvon:\nName: $  name \nEmail: $  email \nBetrifft: $  subject \nTelefon: $  phone \n\nNachricht: $  comments ";             $  headers = 'From: <'.$  emailTo.'>' . "\r\n" . 'Reply-To: ' . $  email. "\r\n";             $  headers .= "MIME-Version: 1.0\r\n";                 $  headers .= "Content-type: text/plain; charset=utf-8\r\n";                 $  headers .= "Content-Transfer-Encoding: 8bit";                          mail($  emailTo, $  msubject, $  body, $  headers);                           $  emailSent = true;          }     } } ?>   <?php get_header(); ?>                                   <div id="page-entry">                           <?php if(isset($  hasError) || isset($  captchaError)) { ?>         <h1>Sorry, <?php echo $  name;?></h1>             <p class="error">Bei der &Uuml;bermittlung hat es einen Fehler gegeben!<p>         <?php } ?>                                   <?php if(isset($  emailSent) && $  emailSent == true) { ?>      <div class="thanks">         <h2>Vielen Dank, <?php echo $  name;?></h2>         <p><?php echo $  response; ?></p>     </div>  <?php } else { ?>      <?php if (have_posts()) : ?>          <?php while (have_posts()) : the_post(); ?>                            <h1 class="post-title"><?php the_title(); ?></h1>                             <div class="contact-content">                  <?php the_content(); ?>                  <?php include ("google-map-iframe.php"); ?>         </div><!-- eof contact content -->                               <div class="contactform">           <?php if(isset($  _POST["object-title"])) { ?>         <div class="selected-offer">                               <p><?php echo $  offerinfo; ?> <a href="<?php echo $  _POST["object-link"] ?>"><?php echo $  _POST["object-title"] ?></a></p>                          </div>         <?php } ?>                        <form action="<?php the_permalink(); ?>" id="contactForm" method="post">           <div class="formcolumn"> <label for="contactName"><?php echo __('Ihr Name','bobox'); ?>*:</label><input required="required" type="text" name="contactName" id="contactName" value="<?php if(isset($  _POST['contactName'])) echo $  _POST['contactName'];?>" class="requiredField" /><?php if(isset($  nameError)) { if($  nameError != '') { ?><span class="error"><?php echo $  nameError;?></span> <?php } } ?>                            <label for="subject"><?php echo __('Betrifft','bobox'); ?>:</label>   <input type="text" name="subject" id="subject" value="<?php if(isset($  _POST['subject']))  echo $  _POST['subject'];?>" class="email" /> </div>          <div class="formcolumn">                  <label for="email"><?php echo __('Ihre E-Mail Adresse','bobox'); ?>*:</label>             <input required="required" type="text" name="email" id="email" value="<?php if(isset($  _POST['email']))  echo $  _POST['email'];?>" class="requiredField email" />                     <?php  if(isset($  emailError)) { if($  emailError != '') { ?>                         <span class="error"><?php echo $  emailError;?></span>                     <?php } }?>            <label for="phone"><?php echo __('Ihre Telefonnummer','bobox'); ?>:</label>   <input type="text" name="phone" id="phone" value="<?php if(isset($  _POST['phone']))  echo $  _POST['phone'];?>" class="email" />     </div>                 <div class="clear"></div>                                            <label for="commentsText"><?php echo __('Ihre Nachricht','bobox'); ?>*:</label>                     <textarea required name="comments" id="commentsText" rows="10" cols="30" class="requiredField"><?php if(isset($  _POST['comments'])) { if(function_exists('stripslashes')) { echo stripslashes($  _POST['comments']); } else { echo $  _POST['comments']; } } ?></textarea>                     <?php if(isset($  commentError)) { if($  commentError != '') { ?>                         <span class="error"><?php echo $  commentError;?></span>                      <?php } } ?>                                       <?php  if(isset($  shdata) && $  shdata == 'yes') { ?>  <div class="wr clearfix">                     <input required="required" type="checkbox" name="contactData" id="contactData" value="true"<?php if(isset($  _POST['contactData']) && $  _POST['contactData'] == true) echo ' checked="checked"'; ?> /><label class="shortleft agreelabel" for="contactData"><?php  echo sprintf( __( 'Ja, ich habe die <a target="_blank" href="%s">Datenschutzerkl&auml;rung</a> gelesen und bin damit einverstanden, dass meine Daten elektronisch erhoben und gespeichert werden. Meine Daten werden ausschlie&szlig;lich zweckgebunden zur Bearbeitung meiner Anfrage genutzt.', 'bobox' ), $  datalink ); ?>*</label></div><?php } ?>                                                <div class="screenReader" style="left: -9999px; position: absolute; top: -9999px;"><label for="checking" class="screenReader">If you want to submit this form, do not enter anything in this field</label><input type="text" name="checking" id="checking" class="screenReader" value="<?php if(isset($  _POST['checking']))  echo $  _POST['checking'];?>" /></div>                   <input type="hidden" name="objectName" id="objectName" value="<?php if(isset($  _POST["object-title"])) { echo $  _POST["object-title"]; } ?>" class="readonly " />                 <input type="hidden" name="submitted" id="submitted" value="true" />                  <button type="submit"><?php echo __('Nachricht jetzt absenden','bobox'); ?></button>                                                 </form>     </div>            <?php endwhile; ?>     <?php endif; ?> <?php } ?>     <div class="clear"></div> </div>     </div><!-- eof content -->  <?php get_footer(); ?> 

and here is "actually" a simple invisible checkbox.

$  errors = array();  //Prüfen ob Formular abgesendet if(isset($  _POST['submit'])) {          //Spamcheck mit jedem neuem Absenden zurücksetzen     $  spamcheck = false;       //Spamcheck     if(!empty($  _POST["repeat_email"]) || isset($  _POST["terms"])) {         $  errors[] = "Zusatzfelder wurden ausgefüllt, wir vermuten Spam und brechen hier ab.";        } else {         $  spamcheck = true;     }      // Eingaben Validieren     if($  spamcheck = true) {           if(empty($  _POST['name'])) { //Wenn Name leer             $  errors[] = "Bitte geben Sie Ihren Namen an";         }                  if(empty($  _POST['email'])){ //Wenn Email leer             $  errors[] = "Bitte Emailadresse angeben";         } elseif (filter_var($  _POST['email'], FILTER_VALIDATE_EMAIL) == false) { //Emailformat überprüfen ab PHP 5.2             $  errors[] = "Bitte geben Sie ein gültige Emailadresse an";         }                          if(empty($  _POST['message'])){ //Wenn Nachricht leer             $  errors[] = "Bitte geben Sie Ihre Nachricht ein";         }          if(!isset($  _POST["gender"])){ //Wenn Spamcheck nicht markiert             $  errors[] = "Bitte bestätigen Sie den Spamcheck";         }                 }      if(isset($  _POST['submit']) && empty($  errors) && $  spamcheck == true) {         // Spamtest bestanden, alle erforderlichen Felder richtig ausgefüllt         // Eintrag in Datenbank oder Email Versand         echo "Alles richtig gemacht";     }  } ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head>  <title>Tutorial: PHP Formular Spamschutz und Validierung – Spam Emails verhindern auch ohne Captcha</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />      <script src="http://codeorigin.jquery.com/jquery-1.10.2.min.js"></script> <script type="text/javascript"> $  (document).ready(function(){     $  ('.terms').append('<input type="text" name="repeat_email" value="test" />'); }); </script>  <style>     /*Demo Formular Styles*/     label { display:inline-block; width:100px; }     input { padding:5px; width:300px; }     input[type="checkbox"] { width:20px; margin-right:10px; }     textarea { width:410px; }        .terms { display:none; } </style>    </head>  <body>        <h2>Demo: PHP Formular Spamschutz und Spamabwehr ohne Captcha</h2>     <p><a href="http://sevenx.de/blog/php-formular-spamschutz-und-validierung-spam-emails-verhindern-auch-ohne-captcha">Zum Blogartikel &raquo; sevenX.de</a></p>          <noscript>Bitte aktivieren Sie Javascript zum Absenden des Formulars oder nutzen Sie eine der alternative Kontaktmöglichkeiten unter www.domain.de/kontakt.htm</noscript>        <?php if(isset($  _POST['submit']) && empty($  errors) === false) {?>       <div style="background:#FCC">           <strong>Bitte überprüfen Sie Ihre Angaben!</strong><br />           <?php echo '<ul><li>'.implode('</li><li>',$  errors).'</li></ul>'; ?>       </div>       <?php } ?>                          <form id="phpform" method="post" action="formular-spamschutz.php">              <p><label for="name">Name<span>*</span></label>             <input type="text" name="name" value="<?=(isset($  _POST['name'])) ? $  _POST['name'] :''?>"></p>              <p><label for="email">Email<span>*</span></label>             <input type="text" name="email" value="<?=(isset($  _POST['email'])) ? $  _POST['email'] :''?>"></p>              <p><label for="message">Nachricht<span>*</span></label><br />             <textarea name="message" rows="8"><?=(isset($  _POST['message'])) ? $  _POST['message'] :''?></textarea></p>              <p><input type="checkbox" name="gender" <?=(isset($  _POST['human'])) ? "checked='checked'" : ''?>><span>*</span> Ich versende keinen Spam</p>              <p><input type="submit" name="submit" value="Absenden"></p>              <div class="terms">             Folgende Felder bitte frei lassen!             <input type="checkbox" name="terms">             </div>                   </form>         <p><a href="http://sevenx.de/" target="_blank">Made with love by sevenX.de - Rico Loschke</a></p>  </body> </html> ```