This package provides a standard for logging in PHP. The package aims to create a multi-use standard.

Please note that this package only contains interfaces for the implementation and a non-logging implementation.

composer require php-unified/log

This interface provides a standard for implementing loggers into applications. It exposes three functions.

This function is meant for logging a message with a severity indication. The severity indication can be picked from the constants defined in the interface.

The constants in this class can be used to determine the severity of the log.

The system has become unuseable. Multiple components of the system have stopped working.

A fatal(ity) is a complete failure of the application. Immediate action should be taken. Normal operation most likely can not be continued without action. The user experience is completely disrupted.

An error is a significant failure in the application. These types of errors should be prioritized. Normal operation can continue, but might disrupt again. The user experience did get affected.

A warning is a potential failure in the application. Normal operation can continue, but the underlying issue can result in additional issues with a greater severity. The user experience most likely didn't get affected.

A notice is a minor disruption in the application. Normal operation is possible. However the warning can have adverse affects if left untreated.

These logs are meant to supply information about the system. E.g. which processes have been run.

Logs information meant for developers. E.g. performance statistics.

This interface provides a standard for an implementation which can optionally log information. This can be useful when less information should be logged in a production environment opposed to development environments.

This interface provides a standard for multi-logger. The implementation of this interface should function a pass-through to several other implementations of the LoggerInterface. This could be useful if logs should be stored in multiple places or in different formats.

For this interface, an implementation is provided. See: PhpUnified\Log\TransitLogger.

To create an implementation which requires a logger, implement the following snippet:

namespace YourOrganization\YourPackage;

use PhpUnified\Log\Common\LoggerInterface;

class YourClass
{
    /**
     * @var LoggerInterface
     */
    private $logger;

    /**
     * Constructor
     *
     * @param LoggerInterface $logger
     */
    public function __construct(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }

    /**
     * The description of my function.
     *
     * @return void
     */
    public function myFunction(): void
    {
        //some code
        $this->logger->log(LoggerInterface::WARNING, 'Something non-severe happened.');
    }
}

To create an implementation which can optionally log information, implement the following snippet:

namespace YourOrganization\YourPackage;

use PhpUnified\Log\Common\OptionalLoggingInterface;
use PhpUnified\Log\Common\LoggerInterface;

class YourClass implements OptionalLoggingInterface
{
    /**
     * @var LoggerInterface
     */
    private $logger;

    /**
     * Optionally set a logger after instantiation.
     *
     * @param LoggerInterface $logger
     *
     * @return void
     */
    public function setLogger(LoggerInterface $logger): void
    {
        $this->logger = $logger;
    }

    /**
     * The description of my function.
     *
     * @return void
     */
    public function myFunction(): void
    {
        //some code
        if ($this->logger !== null) {
            $this->logger->log(LoggerInterface::WARNING, 'Something non-severe happened.');
        }
    }
}

Please see CHANGELOG for more information on what has changed recently.

Please see CONTRIBUTING and CODE_OF_CONDUCT for details.

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