What are the best practices for securely including external content in a PHP website to prevent design inconsistencies or layout issues?

When including external content in a PHP website, it is important to sanitize and validate the content to prevent any malicious code injection that could lead to design inconsistencies or layout issues. One way to securely include external content is by using PHP's `htmlspecialchars()` function to encode any special characters in the content before displaying it on the website. 

<?php
// External content to include
$external_content = "<script>alert('Malicious code injected!')</script>";

// Sanitize and validate the external content
$sanitized_content = htmlspecialchars($external_content);

// Display the sanitized content on the website
echo $sanitized_content;
?>

Keywords

Cross-site scripting Content Security Policy HTML Purifier External Content Sanitization

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