What are best practices for ensuring that only the intended data is included in dynamically generated content for download in PHP, without any additional HTML elements?

When generating content for download in PHP, it's important to ensure that only the intended data is included without any additional HTML elements. To achieve this, you can use output buffering to capture the content and strip away any unwanted HTML tags before sending the file to the user. 

<?php
ob_start(); // Start output buffering

// Generate the content here
$data = "This is the data to be downloaded";

// Strip away any HTML tags
$data = strip_tags($data);

ob_end_clean(); // Clean (erase) the output buffer

// Set appropriate headers for download
header('Content-Type: text/plain');
header('Content-Disposition: attachment; filename="download.txt"');

// Output the data for download
echo $data;
exit;
?>

Keywords

XSS prevention htmlspecialchars htmlentities content-disposition file download

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