Seldaek_monolog/src/Monolog/Processor/IntrospectionProcessor.php

<?php

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

namespace Monolog\Processor;

/**
 * Injects line/file:class/function where the log message came from
 *
 * @author Jordi Boggiano <j.boggiano@seld.be>
 */
class IntrospectionProcessor
{
    /**
     * @param array $record
     * @return array
     */
    public function __invoke(array $record)
    {
        $trace = debug_backtrace();

        // skip first since it's always the current method
        array_shift($trace);
        // the call_user_func call is also skipped
        array_shift($trace);

        $i = 0;
        while (isset($trace[$i]['class']) && false !== strpos($trace[$i]['class'], 'Monolog\\')) {
            $i++;
        }

        // we should have the call source now
        $record['extra'] = array_merge(
            $record['extra'],
            array(
                'file'      => isset($trace[$i-1]['file']) ? $trace[$i-1]['file'] : null,
                'line'      => isset($trace[$i-1]['line']) ? $trace[$i-1]['line'] : null,
                'class'     => isset($trace[$i]['class']) ? $trace[$i]['class'] : null,
                'function'  => isset($trace[$i]['function']) ? $trace[$i]['function'] : null,
            )
        );

        return $record;
    }
}