PSR-3 Static Factory Approach

StaticImplementation.php

<?php

use Psr\Log\LoggerInterface;

class Foo
{
    private $logger;

    public function __construct()
    {
        $this->logger = MyStaticFactory::getLog();        
    }

    public function doSomething()
    {
        if ($this->logger) {
            $this->logger->info('Doing work');
        }

        // do something useful
    }
}