What potential pitfalls can arise from not properly closing form tags in PHP scripts, and how can this impact data transmission?

If form tags are not properly closed in PHP scripts, it can lead to unexpected behavior such as incorrect data transmission or form submission errors. This can result in incomplete or corrupted data being sent to the server, causing issues with processing the form data. To prevent this, always make sure to properly close form tags in PHP scripts to ensure smooth data transmission.

<form method="post" action="submit.php">
  <input type="text" name="username">
  <input type="submit" value="Submit">
</form>