<?php

/**

* Formats HTML output for non-production use.

*

* This function applies basic formatting to HTML output,

* including indentation and line breaks, to improve readability.

*

* @param string $html The HTML string to format.

* @return string The formatted HTML string.

*/

function formatHtml(string $html): string

{

// Use HTMLPurifier to safely format HTML.

// This helps prevent XSS vulnerabilities.

$purifier = new \HTMLPurifier();

$config = $purifier->getDefConfig();

$purifier->config($config);

// Format the HTML content.

$formattedHtml = $purifier->purify($html);

// Indent the HTML for better readability.

$lines = explode("\n", $formattedHtml);

$indentedLines = array_map(function ($line) {

return str_repeat(" ", strlen(str_getcsv($line, "\n", PHP_EOL)) ); // Indent by 4 spaces

}, $lines);

// Join the indented lines back into a single string.

$formattedHtml = implode("\n", $indentedLines);

return $formattedHtml;

}

//Example usage (for testing)

if (isset($_GET['format'])) {

$html = $_GET['html'];

echo formatHtml($html);

}

?>