Loggable.php

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<?php

namespace Elgg;

use Psr\Log\LoggerInterface;

trait Loggable {

    private $logger;

    public function setLogger(LoggerInterface $logger = null) {
        $this->logger = $logger;
    }

    public function getLogger() {

        if ($this->logger) {
            return $this->logger;
        } else if (Application::$_instance) {
            return Application::$_instance->_services->logger;
        }

        // Application hasn't been bootstrapped
        return Logger::factory();
    }

    public function log($level, $message, array $context = []) {
        if ($message instanceof \Throwable) {
            if (!isset($message->timestamp)) {
                $message->timestamp = time();
            }

            $context['exception'] = $message;
        }

        // PSR interface is void, but Monolog returns a boolean
        $logged = $this->getLogger()->log($level, $message, $context);
        return isset($logged) ? $logged : true;
    }

}