How can the PHP script be modified to ensure that data is only written to the file and emails are sent if all form fields are correctly filled out?

To ensure that data is only written to the file and emails are sent if all form fields are correctly filled out, you can add a validation check before processing the form data. This check should verify that all required fields are not empty or contain valid data. If any field fails the validation, the script should display an error message and prevent further processing. 

if(isset($_POST['submit'])){
    // Validate form fields
    $errors = array();
    if(empty($_POST['name'])){
        $errors[] = "Name is required";
    }
    if(empty($_POST['email']) || !filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)){
        $errors[] = "Valid email is required";
    }
    
    // If no errors, proceed with writing to file and sending email
    if(empty($errors)){
        // Write data to file
        $file = 'data.txt';
        $data = $_POST['name'] . ' - ' . $_POST['email'] . PHP_EOL;
        file_put_contents($file, $data, FILE_APPEND);
        
        // Send email
        $to = 'recipient@example.com';
        $subject = 'New Form Submission';
        $message = 'Name: ' . $_POST['name'] . PHP_EOL;
        $message .= 'Email: ' . $_POST['email'];
        mail($to, $subject, $message);
        
        echo 'Form submitted successfully!';
    } else {
        // Display errors
        foreach($errors as $error){
            echo $error . '<br>';
        }
    }
}

Keywords

PHP form validation conditional statements file writing email sending

Related Questions