How can proper HTML form tag syntax improve the functionality of PHP scripts?

Proper HTML form tag syntax is essential for PHP scripts to function correctly because it ensures that data is sent to the server in the expected format. This includes defining the form action, method, and input fields with appropriate names. By following the correct syntax, PHP scripts can accurately process the form data and perform the desired actions.

<form action="process_form.php" method="post">
  <input type="text" name="username" placeholder="Username">
  <input type="password" name="password" placeholder="Password">
  <button type="submit">Submit</button>
</form>