Traits logger

with-traits.php

<?php

interface Loggable
{
    public function log($message, $level);
    
    public function setLogger(LoggerInterface $logger);
}

trait Logger
{
    private $logger;
    
    public function setLogger(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }
    
    public function log($message, $level)
    {
        $this->logger->log($message);
    }
}
    
class Foo implements Loggable
{
    use Logger;
}

without-traits.php

<?php

interface Loggable
{
    public function log($message, $level);
    
    public function setLogger(LoggerInterface $logger);
}

class Logger
{
    private $logger;
    
    public function setLogger(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }
    
    public function log($message, $level)
    {
        $this->logger->log($message);
    }
}
    
class Foo extends Logger
{
    use Logger;
}