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Extending Monolog

Monolog is fully extensible, allowing you to adapt your logger to your needs.

Writing your own handler

Monolog provides many built-in handlers. But if the one you need does not exist, you can write it and use it in your logger. The only requirement is to implement Monolog\Handler\HandlerInterface.

Let's write a PDOHandler to log records to a database. We will extend the abstract class provided by Monolog to keep things DRY.

```php <?php

use Monolog; use Monolog;

class PDOHandler extends AbstractProcessingHandler { private $initialized = false; private $pdo; private $statement;

public function __construct(PDO $pdo, $level = Logger::DEBUG, $bubble = true) { $this->pdo = $pdo; parent::__construct($level, $bubble); }

protected function write(array $record) { if (!$this->initialized) { $this->initialize(); }

$this->statement->execute(array( 'channel' => $record['channel'], 'level' => $record['level'], 'message' => $record['formatted'], 'time' => $record['datetime']->format('U'), )); }

private function initialize() { $this->pdo->exec( 'CREATE TABLE IF NOT EXISTS monolog ' .'(channel VARCHAR(255), level INTEGER, message LONGTEXT, time INTEGER UNSIGNED)' ); $this->statement = $this->pdo->prepare( 'INSERT INTO monolog (channel, level, message, time) VALUES (:channel, :level, :message, :time)' );

$this->initialized = true; } } ```

You can now use this handler in your logger:

```php <?php

$logger->pushHandler(new PDOHandler(new PDO('sqlite:logs.sqlite')));

// You can now use your logger $logger->addInfo('My logger is now ready'); ```

The Monolog\Handler\AbstractProcessingHandler class provides most of the logic needed for the handler, including the use of processors and the formatting of the record (which is why we use $record['formatted'] instead of $record['message']).

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