use Psr\Log\LoggerInterface; class MyClass { private $logger; public function __construct(LoggerInterface $logger) { $this->logger = $logger; } public function doSomething() { // ... $this->logger->notice('Something happened.'); // ... } }This code creates an instance of the LoggerInterface in a class constructor and logs a notice-level message within a method. The logging library that implements the psr.log LoggerInterface can vary, but popular examples include Monolog and Log4php libraries. In summary, the psr.log LoggerInterface notice helps to standardize logging practices in PHP and enables different logging libraries to work together seamlessly.