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    <h3>Editing: FirePHPHandler.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\Handler;

use Monolog\Formatter\WildfireFormatter;
use Monolog\Formatter\FormatterInterface;

/**
 * Simple FirePHP Handler (http://www.firephp.org/), which uses the Wildfire protocol.
 *
 * @author Eric Clemmons (@ericclemmons) &lt;eric@uxdriven.com&gt;
 *
 * @phpstan-import-type FormattedRecord from AbstractProcessingHandler
 */
class FirePHPHandler extends AbstractProcessingHandler
{
    use WebRequestRecognizerTrait;

    /**
     * WildFire JSON header message format
     */
    protected const PROTOCOL_URI = 'http://meta.wildfirehq.org/Protocol/JsonStream/0.2';

    /**
     * FirePHP structure for parsing messages &amp; their presentation
     */
    protected const STRUCTURE_URI = 'http://meta.firephp.org/Wildfire/Structure/FirePHP/FirebugConsole/0.1';

    /**
     * Must reference a &quot;known&quot; plugin, otherwise headers won't display in FirePHP
     */
    protected const PLUGIN_URI = 'http://meta.firephp.org/Wildfire/Plugin/FirePHP/Library-FirePHPCore/0.3';

    /**
     * Header prefix for Wildfire to recognize &amp; parse headers
     */
    protected const HEADER_PREFIX = 'X-Wf';

    /**
     * Whether or not Wildfire vendor-specific headers have been generated &amp; sent yet
     * @var bool
     */
    protected static $initialized = false;

    /**
     * Shared static message index between potentially multiple handlers
     * @var int
     */
    protected static $messageIndex = 1;

    /** @var bool */
    protected static $sendHeaders = true;

    /**
     * Base header creation function used by init headers &amp; record headers
     *
     * @param array&lt;int|string&gt; $meta    Wildfire Plugin, Protocol &amp; Structure Indexes
     * @param string            $message Log message
     *
     * @return array&lt;string, string&gt; Complete header string ready for the client as key and message as value
     *
     * @phpstan-return non-empty-array&lt;string, string&gt;
     */
    protected function createHeader(array $meta, string $message): array
    {
        $header = sprintf('%s-%s', static::HEADER_PREFIX, join('-', $meta));

        return [$header =&gt; $message];
    }

    /**
     * Creates message header from record
     *
     * @return array&lt;string, string&gt;
     *
     * @phpstan-return non-empty-array&lt;string, string&gt;
     *
     * @see createHeader()
     *
     * @phpstan-param FormattedRecord $record
     */
    protected function createRecordHeader(array $record): array
    {
        // Wildfire is extensible to support multiple protocols &amp; plugins in a single request,
        // but we're not taking advantage of that (yet), so we're using &quot;1&quot; for simplicity's sake.
        return $this-&gt;createHeader(
            [1, 1, 1, self::$messageIndex++],
            $record['formatted']
        );
    }

    /**
     * {@inheritDoc}
     */
    protected function getDefaultFormatter(): FormatterInterface
    {
        return new WildfireFormatter();
    }

    /**
     * Wildfire initialization headers to enable message parsing
     *
     * @see createHeader()
     * @see sendHeader()
     *
     * @return array&lt;string, string&gt;
     */
    protected function getInitHeaders(): array
    {
        // Initial payload consists of required headers for Wildfire
        return array_merge(
            $this-&gt;createHeader(['Protocol', 1], static::PROTOCOL_URI),
            $this-&gt;createHeader([1, 'Structure', 1], static::STRUCTURE_URI),
            $this-&gt;createHeader([1, 'Plugin', 1], static::PLUGIN_URI)
        );
    }

    /**
     * Send header string to the client
     */
    protected function sendHeader(string $header, string $content): void
    {
        if (!headers_sent() &amp;&amp; self::$sendHeaders) {
            header(sprintf('%s: %s', $header, $content));
        }
    }

    /**
     * Creates &amp; sends header for a record, ensuring init headers have been sent prior
     *
     * @see sendHeader()
     * @see sendInitHeaders()
     */
    protected function write(array $record): void
    {
        if (!self::$sendHeaders || !$this-&gt;isWebRequest()) {
            return;
        }

        // WildFire-specific headers must be sent prior to any messages
        if (!self::$initialized) {
            self::$initialized = true;

            self::$sendHeaders = $this-&gt;headersAccepted();
            if (!self::$sendHeaders) {
                return;
            }

            foreach ($this-&gt;getInitHeaders() as $header =&gt; $content) {
                $this-&gt;sendHeader($header, $content);
            }
        }

        $header = $this-&gt;createRecordHeader($record);
        if (trim(current($header)) !== '') {
            $this-&gt;sendHeader(key($header), current($header));
        }
    }

    /**
     * Verifies if the headers are accepted by the current user agent
     */
    protected function headersAccepted(): bool
    {
        if (!empty($_SERVER['HTTP_USER_AGENT']) &amp;&amp; preg_match('{\bFirePHP/\d+\.\d+\b}', $_SERVER['HTTP_USER_AGENT'])) {
            return true;
        }

        return isset($_SERVER['HTTP_X_FIREPHP_VERSION']);
    }
}
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