Enable query logging for Doctrine in Silex

Application.php

<?php

if ($this['debug']) {
    $logger = new DebugStack();

    $this->extend('doctrine_orm.configuration', function(Configuration $configuration) use ($logger) {
        $configuration->setSQLLogger($logger);

        return $configuration;
    });

    $this->finish(function() use ($self, $logger) {
        foreach ($logger->queries as $query) {
            $self['monolog']->debug($query['sql'], array('params' => $query['params'], 'types' => $query['types']));
        }
    });
}