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I'm getting the following error on a contact form I'm trying to implement: Fatal error: Uncaught Error: Undefined constant "secretcode" in /home/foxclo98/test.foxclone.com/contact.php:33 Stack trace: #0 {main} thrown in /home/foxclo98/test.foxclone.com/contact.php on line 33 Here's the full code of the contact form: <?php $errorlevel=error_reporting(); error_reporting($errorlevel & ~E_WARNING); //...code that generates notices error_reporting($errorlevel); // initialization session_start(); $email_contact = "[email protected]"; $email_website = "[email protected]"; // definition of permitted types/subject/category. use to dynamically build the option list, // pre-selecting any existing choice, and used in the validation logic $permitted_types = ['Questions', 'Report Problem', 'Suggestion', 'Other', 'Website Problem']; $secretcode = ['nospam']; $post = []; // array to hold a trimmed working copy of the form data $errors = []; // array to hold user/validation errors // post method form processing if($_SERVER['REQUEST_METHOD'] == 'POST') { // trim all the data at once $post = array_map('trim',$_POST); // if any of the fields are arrays, use a recursive call-back function here instead of php's trim function // inputs: name, email, type/subject/category, message - all required // validate the inputs $errors = []; //Other validation stuff. if ($post['secretcode'] != 'nospam') { $errors[secretcode] = 'You did not enter the correct secret code.'; } if($post['name'] === '') { $errors['name'] = 'Name is required.'; } if($post['email'] === '') { $errors['email'] = 'Email is required.'; } else { // while it is true that the following email format validation will produce an error // for an empty value, you should specifically tell the visitor what is wrong with what // they submitted if (false === filter_var($post['email'], FILTER_VALIDATE_EMAIL)) { $errors['email'] = 'The Email Address you entered does not appear to be valid.'; } } if($post['type'] === '') { $errors['type'] = 'You must select a Type/Subject/Category.'; } else { // you will only see the following error due to a programming mistake or someone/something submitting their own values if(!in_array($post['type'],$permitted_types)) { $errors['type'] = 'The selected Type is invalid.'; // you would want to log the occurrence of this here... } } if($post['message'] === '') { $errors['message'] = 'Message is required.'; } else { if(strlen($post['message']) < 10) { $errors['message'] = 'The Message must be at least 10 characters.'; } } // if no errors, use the submitted data if(empty($errors)) { // apply htmlentities() to help prevent cross site scripting when viewing the received email in a browser $formcontent = htmlentities("From: {$post['name']}\r\nEmail: {$post['email']}\r\nSubject: {$post['type']}\r\nMessage: {$post['message']}", ENT_QUOTES); if ($post['type'] === "Website Problem") { $recipient=$email_website; } else { $recipient=$email_contact; } $email = $post['email']; // add $post['email'] as a Reply-to: header if desired, it is one, valid email address at this point $mailheader = "From: $email\r\n" ; $mailheader .= "Cc: $email\r\n"; if(!mail($recipient, $post['type'], $formcontent, $mailheader)) { // an error // setup the user error message $errors['mail'] = 'The email could not be sent, the site owner has been notified.'; // system error handling goes here... - datatime, get the last error message, include the mail parameter values... // at this point, all parameters are either an internal value, have been validated they they are just an expected // value/format, or have had htmlentities() applied. } // if no errors at this point, success if(empty($errors)) { $_SESSION['success_message'] = "Mail Sent. Thank you {$post['name']}, we will contact you shortly.."; die(header("Refresh:0")); } } } // html document starts here... ?> <?php // display any success message if(!empty($_SESSION['success_message'])) { // for demo purposes, just output it as a paragraph. add any markup/styling you want echo '<p>'; echo htmlentities($_SESSION['success_message'], ENT_QUOTES); echo " - <a href='index.php#home' style='color:#ff0099;'> Return Home</a>"; echo '</p>'; unset($_SESSION['success_message']); } ?> <?php // display any errors if(!empty($errors)) { // for demo purposes, just output them as a paragraph. add any markup/styling you want echo '<p>'; echo implode('<br>',$errors); echo '</p>'; } ?> <?php // (re)display the form here..., re-populating the fields with any existing values ?> <?php require_once("header.php");?> <style> input, select { width: 20rem; line-height:30px; border:2px solid #2f496e; padding: 0; margin: 0; height: 30px; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; font: 500 1rem sans-serif; background: #fff; } .input { text-indent: 3px; } </style> </head> <body> <?PHP require_once("navbar.php"); ?> <!--****************** * CONTACT * *******************--> <div class="head__h1"> Need help? Have a suggestion? Why not send us an email?</div> <div class="subtext"> You'll receive a copy of your inquiry for your records </div> <div class ="download"> <div class="cont__row" style="background-color: #d9b44a;"> <div class="cont__column"> <form method="POST"> <label>Secret Code:</label><br> <input type="text" name="secretcode" id="secretcode" placeholder="Type nospam here"> <br> <br> <label>Name</label><br> <input type="text" name="name"><br> <br> <label>Email</label><br> <input type="email" name="email"><br> <br> <label>Select a Category</label> <br> <select name="type" id="category" size="1"> <option value=''> </option> <option value='Questions'>Questions</option> <option value="Report Problem">Report Problem</option> <option value='Suggestion'>Suggestion</option> <option value='Other'>Other</option> <option value="Website Problem"> Website Problem</option> </select> </div> <div class="cont__column"> <label>Message</label><br> <textarea name="message" rows="10" cols="50" style="font: 500 1rem sans-serif"></textarea><br> <br> <div class="button"> <input type="image" id="myimage" src="images/email1.jpg" style="height:40px; width:160px;"/> </form> </div> </div> </div> </div> <?PHP require_once("footer.php"); ?> I'd appreciate ssome help on this.