What potential pitfalls should be considered when attempting to print PHP-generated content?

When attempting to print PHP-generated content, it is important to be cautious of potential security vulnerabilities such as cross-site scripting (XSS) attacks. To prevent this, always sanitize and validate user input before printing it to the screen. Additionally, be mindful of the content being printed, as certain characters or formatting could disrupt the layout of the page. 

// Sanitize and validate user input before printing
$userInput = $_POST['user_input'];
$cleanInput = htmlspecialchars($userInput);

// Print the sanitized input
echo $cleanInput;

Keywords

XSS security vulnerabilities output buffering htmlentities escaping data

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