In what situations would using JavaScript for user input confirmation be beneficial in PHP applications?

When building PHP applications, using JavaScript for user input confirmation can be beneficial in situations where you want to provide immediate feedback to the user before submitting a form. This can help prevent unnecessary form submissions and improve the overall user experience by confirming their input choices.

<form action="submit.php" method="post" onsubmit="return confirm('Are you sure you want to submit this form?');">
  <input type="text" name="username" placeholder="Enter your username">
  <input type="submit" value="Submit">
</form>