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    <h3>Editing: HtmlFormatter.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types=1);

/*
 * This file is part of the Monolog package.
 *
 * (c) Jordi Boggiano &lt;j.boggiano@seld.be&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Monolog\Formatter;

use Monolog\Logger;
use Monolog\Utils;

/**
 * Formats incoming records into an HTML table
 *
 * This is especially useful for html email logging
 *
 * @author Tiago Brito &lt;tlfbrito@gmail.com&gt;
 */
class HtmlFormatter extends NormalizerFormatter
{
    /**
     * Translates Monolog log levels to html color priorities.
     *
     * @var array&lt;int, string&gt;
     */
    protected $logLevels = [
        Logger::DEBUG     =&gt; '#CCCCCC',
        Logger::INFO      =&gt; '#28A745',
        Logger::NOTICE    =&gt; '#17A2B8',
        Logger::WARNING   =&gt; '#FFC107',
        Logger::ERROR     =&gt; '#FD7E14',
        Logger::CRITICAL  =&gt; '#DC3545',
        Logger::ALERT     =&gt; '#821722',
        Logger::EMERGENCY =&gt; '#000000',
    ];

    /**
     * @param string|null $dateFormat The format of the timestamp: one supported by DateTime::format
     */
    public function __construct(?string $dateFormat = null)
    {
        parent::__construct($dateFormat);
    }

    /**
     * Creates an HTML table row
     *
     * @param string $th       Row header content
     * @param string $td       Row standard cell content
     * @param bool   $escapeTd false if td content must not be html escaped
     */
    protected function addRow(string $th, string $td = ' ', bool $escapeTd = true): string
    {
        $th = htmlspecialchars($th, ENT_NOQUOTES, 'UTF-8');
        if ($escapeTd) {
            $td = '&lt;pre&gt;'.htmlspecialchars($td, ENT_NOQUOTES, 'UTF-8').'&lt;/pre&gt;';
        }

        return &quot;&lt;tr style=\&quot;padding: 4px;text-align: left;\&quot;&gt;\n&lt;th style=\&quot;vertical-align: top;background: #ccc;color: #000\&quot; width=\&quot;100\&quot;&gt;$th:&lt;/th&gt;\n&lt;td style=\&quot;padding: 4px;text-align: left;vertical-align: top;background: #eee;color: #000\&quot;&gt;&quot;.$td.&quot;&lt;/td&gt;\n&lt;/tr&gt;&quot;;
    }

    /**
     * Create a HTML h1 tag
     *
     * @param  string $title Text to be in the h1
     * @param  int    $level Error level
     * @return string
     */
    protected function addTitle(string $title, int $level): string
    {
        $title = htmlspecialchars($title, ENT_NOQUOTES, 'UTF-8');

        return '&lt;h1 style=&quot;background: '.$this-&gt;logLevels[$level].';color: #ffffff;padding: 5px;&quot; class=&quot;monolog-output&quot;&gt;'.$title.'&lt;/h1&gt;';
    }

    /**
     * Formats a log record.
     *
     * @return string The formatted record
     */
    public function format(array $record): string
    {
        $output = $this-&gt;addTitle($record['level_name'], $record['level']);
        $output .= '&lt;table cellspacing=&quot;1&quot; width=&quot;100%&quot; class=&quot;monolog-output&quot;&gt;';

        $output .= $this-&gt;addRow('Message', (string) $record['message']);
        $output .= $this-&gt;addRow('Time', $this-&gt;formatDate($record['datetime']));
        $output .= $this-&gt;addRow('Channel', $record['channel']);
        if ($record['context']) {
            $embeddedTable = '&lt;table cellspacing=&quot;1&quot; width=&quot;100%&quot;&gt;';
            foreach ($record['context'] as $key =&gt; $value) {
                $embeddedTable .= $this-&gt;addRow((string) $key, $this-&gt;convertToString($value));
            }
            $embeddedTable .= '&lt;/table&gt;';
            $output .= $this-&gt;addRow('Context', $embeddedTable, false);
        }
        if ($record['extra']) {
            $embeddedTable = '&lt;table cellspacing=&quot;1&quot; width=&quot;100%&quot;&gt;';
            foreach ($record['extra'] as $key =&gt; $value) {
                $embeddedTable .= $this-&gt;addRow((string) $key, $this-&gt;convertToString($value));
            }
            $embeddedTable .= '&lt;/table&gt;';
            $output .= $this-&gt;addRow('Extra', $embeddedTable, false);
        }

        return $output.'&lt;/table&gt;';
    }

    /**
     * Formats a set of log records.
     *
     * @return string The formatted set of records
     */
    public function formatBatch(array $records): string
    {
        $message = '';
        foreach ($records as $record) {
            $message .= $this-&gt;format($record);
        }

        return $message;
    }

    /**
     * @param mixed $data
     */
    protected function convertToString($data): string
    {
        if (null === $data || is_scalar($data)) {
            return (string) $data;
        }

        $data = $this-&gt;normalize($data);

        return Utils::jsonEncode($data, JSON_PRETTY_PRINT | Utils::DEFAULT_JSON_FLAGS, true);
    }
}
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