How can the user modify the existing script to include line breaks after replacing tabs with spaces?

The user can modify the existing script by adding the PHP function nl2br() to insert line breaks after replacing tabs with spaces. This function converts newlines to HTML line breaks <br> tags, allowing for proper formatting when displaying the text on a webpage.

<?php
// Sample text with tabs
$text = "Hello\tworld!\tThis\tis\ta\ttest.";

// Replace tabs with spaces
$text = str_replace("\t", " ", $text);

// Insert line breaks after replacing tabs
$text = nl2br($text);

// Output the modified text
echo $text;
?>