PHP
Secure HTML Output Escaping
Learn to prevent Cross-Site Scripting (XSS) attacks by properly escaping user-generated content before rendering it in HTML, ensuring robust web application security.
<?php
$user_input = "<script>alert('XSS Attack!');</script>";
$safe_output = htmlspecialchars($user_input, ENT_QUOTES | ENT_HTML5, 'UTF-8');
echo "<p>Your input: " . $safe_output . "</p>";
?>
How it works: This snippet demonstrates how to use `htmlspecialchars()` in PHP to escape potentially malicious user input before displaying it in HTML. The `ENT_QUOTES` flag converts both single and double quotes, `ENT_HTML5` ensures HTML5 compatibility, and `UTF-8` specifies the character encoding, effectively neutralizing most XSS vectors by converting special characters into HTML entities.