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The validation fails because the file containing the validation logic is never executed when the form is submitted. The standard and most effective solution is to handle everything in one file. The form page should be responsible for: Displaying the form. Receiving the submitted data. Validating the data. If invalid, re-displaying the form with errors. If valid, performing the final action (like sending an email). You just need to move the email-sending logic from form.php into the else block of your validation file. Here is the corrected and combined code. You can replace the entire contents of your first file with this. You will no longer need form.php at all. <?php // 1. SETUP $user = ['name' => '', 'age' => '']; $errors = ['name' => '', 'age' => '']; $message = ''; $form_submitted_successfully = false; // A flag to know when to hide the form // 2. PROCESS FORM IF SUBMITTED if ($_SERVER['REQUEST_METHOD'] == 'POST') { // Validation filters $validation_filters['name']['filter'] = FILTER_VALIDATE_REGEXP; $validation_filters['name']['options']['regexp'] = '/^[A-z]{2,10}$/'; $validation_filters['age']['filter'] = FILTER_VALIDATE_INT; $validation_filters['age']['options']['min_range'] = 16; $validation_filters['age']['options']['max_range'] = 65; $user_input = filter_input_array(INPUT_POST, $validation_filters); // Create error messages $errors['name'] = $user_input['name'] ? '' : 'Name must be 2-10 letters using A-z'; $errors['age'] = $user_input['age'] ? '' : 'You must be between 16 and 65'; // Sanitize the original POST data to redisplay it safely in the form $user['name'] = filter_var($_POST['name'], FILTER_SANITIZE_FULL_SPECIAL_CHARS); $user['age'] = filter_var($_POST['age'], FILTER_SANITIZE_NUMBER_INT); // Check if there are any errors by joining all error messages $invalid = implode($errors); // 3. DECIDE WHAT TO DO NEXT if ($invalid) { // If there are errors, show an error message $message = 'Please correct the following errors:'; } else { // If data is valid, SEND THE EMAIL $to = '[email protected]'; // Use a real email address $subject = 'Contact Form Submission'; $msg = "Name: {$user['name']}\n" . "Age: {$user['age']}\n"; $headers = 'From: [email protected]'; // It's good practice to set a From header // The mail() function returns true on success, false on failure if (mail($to, $subject, $msg, $headers)) { $message = 'Thank you, your data has been sent!'; $form_submitted_successfully = true; // Set flag to true } else { $message = 'Sorry, there was an error sending your message. Please try again later.'; } } } ?> <?php // include 'includes/header.php'; // Assuming you have this file ?> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Validation Form</title> <style> .error { color: red; font-size: 0.8em; display: block; } body { font-family: sans-serif; } input { margin-bottom: 10px; } form { border: 1px solid #ccc; padding: 20px; max-width: 400px; } .message { padding: 10px; background-color: #e0e0e0; margin-bottom: 15px; } </style> </head> <body> <h1>Contact Us</h1> <?php if ($message): ?> <p class="message"><?= $message ?></p> <?php endif; ?> <?php // Only show the form if it hasn't been submitted successfully if (!$form_submitted_successfully): ?> <form name="form" action="" method="POST"> Name: <input type="text" name="name" value="<?= htmlspecialchars($user['name']) ?>"> <span class="error"><?= $errors['name'] ?></span><br> Age: <input type="text" name="age" value="<?= htmlspecialchars($user['age']) ?>"> <span class="error"><?= $errors['age'] ?></span><br> <input type="submit" value="Submit"> </form> <?php endif; ?> </body> </html>1 point
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Understand that this is a completely different problem than the one you asked for. Specifically, this is a great example of the X/Y problem: asking about your solution of "how to restrict window/tab sessions in PHP" as a means of accomplishing "we want to run some performance testing using multiple independent Chrome windows". Chrome is capable of running an instance (of the version installed on the computer) using a specific profile directory. It takes a little more setup since you need to create multiple profile directories, but that can be done mostly automatically with appropriate automation. If you're searching the internet for answers then look in the direction of automated UI testing: that universally involves scripting a browser to perform actions, which is what you want to do.1 point
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Firefox has an extension called Multi-Account Containers that allows you to basically sandbox each tab and prevent communication. Much like using private windows, but in tabs.1 point
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PHP can't tell the difference between one tab/window or another. The only option is to restrict all browsing such that the user never even leaves the page at all: by rewriting your site from the ground-up into a single-page application ("SPA"), meaning you're going to set aside a lot of PHP and do the majority of work in Javascript with frameworks like React. And by the way, this is a bad idea.1 point
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