In PHP, what is the significance of using backslashes to escape characters in HTML output, and how does it affect readability for beginners?

When outputting HTML in PHP, certain characters like double quotes or angle brackets need to be escaped using backslashes to prevent them from being interpreted as part of the HTML syntax. This is important for maintaining the integrity of the HTML structure and avoiding syntax errors. For beginners, using backslashes may seem confusing at first, but it is a necessary practice to ensure proper output formatting.

<?php
$variable = "This is a \"quoted\" string with <html> tags";
echo htmlspecialchars($variable);
?>