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    <h3>Editing: PsrLogMessageProcessor.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\Processor;

use Monolog\Utils;

/**
 * Processes a record's message according to PSR-3 rules
 *
 * It replaces {foo} with the value from $context['foo']
 *
 * @author Jordi Boggiano &lt;j.boggiano@seld.be&gt;
 */
class PsrLogMessageProcessor implements ProcessorInterface
{
    public const SIMPLE_DATE = &quot;Y-m-d\TH:i:s.uP&quot;;

    /** @var string|null */
    private $dateFormat;

    /** @var bool */
    private $removeUsedContextFields;

    /**
     * @param string|null $dateFormat              The format of the timestamp: one supported by DateTime::format
     * @param bool        $removeUsedContextFields If set to true the fields interpolated into message gets unset
     */
    public function __construct(?string $dateFormat = null, bool $removeUsedContextFields = false)
    {
        $this-&gt;dateFormat = $dateFormat;
        $this-&gt;removeUsedContextFields = $removeUsedContextFields;
    }

    /**
     * {@inheritDoc}
     */
    public function __invoke(array $record): array
    {
        if (false === strpos($record['message'], '{')) {
            return $record;
        }

        $replacements = [];
        foreach ($record['context'] as $key =&gt; $val) {
            $placeholder = '{' . $key . '}';
            if (strpos($record['message'], $placeholder) === false) {
                continue;
            }

            if (is_null($val) || is_scalar($val) || (is_object($val) &amp;&amp; method_exists($val, &quot;__toString&quot;))) {
                $replacements[$placeholder] = $val;
            } elseif ($val instanceof \DateTimeInterface) {
                if (!$this-&gt;dateFormat &amp;&amp; $val instanceof \Monolog\DateTimeImmutable) {
                    // handle monolog dates using __toString if no specific dateFormat was asked for
                    // so that it follows the useMicroseconds flag
                    $replacements[$placeholder] = (string) $val;
                } else {
                    $replacements[$placeholder] = $val-&gt;format($this-&gt;dateFormat ?: static::SIMPLE_DATE);
                }
            } elseif ($val instanceof \UnitEnum) {
                $replacements[$placeholder] = $val instanceof \BackedEnum ? $val-&gt;value : $val-&gt;name;
            } elseif (is_object($val)) {
                $replacements[$placeholder] = '[object '.Utils::getClass($val).']';
            } elseif (is_array($val)) {
                $replacements[$placeholder] = 'array'.Utils::jsonEncode($val, null, true);
            } else {
                $replacements[$placeholder] = '['.gettype($val).']';
            }

            if ($this-&gt;removeUsedContextFields) {
                unset($record['context'][$key]);
            }
        }

        $record['message'] = strtr($record['message'], $replacements);

        return $record;
    }
}
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