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This repository holds all interfaces/classes/traits related to PSR-3.

Note that this is not a logger of its own. It is merely an interface that describes a logger. See the specification for more details.


composer require psr/log


If you need a logger, you can use the interface like this:

class Foo
    private $logger;

public function __construct(LoggerInterface $logger = null)
    $this->logger = $logger;

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

    try {
    } catch (Exception $exception) {
        $this->logger->error('Oh no!', array('exception' => $exception));

    // do something useful


You can then pick one of the implementations of the interface to get a logger.

If you want to implement the interface, you can require this package and implement

in your code. Please read the specification text for details.

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