BacktraceProcessor.php

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<?php

namespace Elgg\Logger;

use Elgg\Logger;
use Monolog\LogRecord;

class BacktraceProcessor {
    
    private $level;

    private $backtrace_level;

    public function __construct($level = Logger::WARNING, $backtrace_level = -1) {
        $this->level = Logger::toMonologLevel($level);
        $this->backtrace_level = $backtrace_level;
    }

    public function __invoke(LogRecord $record): LogRecord {
        // return if the level is not high enough
        if ($record->level->isLowerThan($this->level)) {
            return $record;
        }

        $backtrace_level = $this->backtrace_level;

        $stack = [];
        $backtrace = debug_backtrace();
        // never show this call.
        $backtrace = array_slice($backtrace,  9); // ignore the monolog stack

        $i = count($backtrace);

        foreach ($backtrace as $trace) {
            if (empty($trace['file'])) {
                // file/line not set for Closures
                $stack[] = "[#$i] unknown";
            } else {
                $stack[] = "[#$i] {$trace['file']}:{$trace['line']}";
            }

            $i--;

            if ($backtrace_level > 0) {
                if ($backtrace_level <= 1) {
                    break;
                }
                
                $backtrace_level--;
            }
        }

        $record['extra']['backtrace'] = $stack;

        return $record;
    }
}