What are the best practices for handling iframe content in PHP, especially when accessing external websites?

When handling iframe content in PHP, especially when accessing external websites, it is important to ensure security measures are in place to prevent malicious code execution or cross-site scripting attacks. One way to do this is by sanitizing the input and validating the URL before loading it in the iframe. Additionally, setting the appropriate headers to prevent clickjacking can further enhance security. 

<?php

// Sanitize and validate the URL
$iframe_url = filter_var($_GET['url'], FILTER_VALIDATE_URL);

// Set X-Frame-Options header to prevent clickjacking
header('X-Frame-Options: DENY');

?>

<iframe src="<?php echo $iframe_url; ?>"></iframe>

Keywords

iframe content security policy cURL cross-origin resource sharing XSS

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