What are the potential pitfalls of not considering HTML context when displaying database content in PHP?

When displaying database content in PHP without considering HTML context, it can lead to security vulnerabilities such as Cross-Site Scripting (XSS) attacks. To prevent this, it is important to properly escape the output data based on the context in which it will be displayed (e.g., HTML, attributes, JavaScript, etc.). This can be done using functions like htmlspecialchars() or htmlentities() to encode special characters. 

<?php
// Fetch data from database
$data = "<script>alert('XSS attack!')</script>";

// Display data safely in HTML context
echo htmlspecialchars($data, ENT_QUOTES, 'UTF-8');
?>

Keywords

XSS SQL injection htmlentities htmlspecialchars escaping

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