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Example code of meritum/logger

Informations about the package logger

meritum/logger

Minimal PSR-3 logger that writes newline-delimited JSON to stdout. Designed for containerized environments where structured log output is consumed by a log aggregator (GCP Cloud Logging, AWS CloudWatch, Datadog, etc.).

Installation

Requirements

Usage

Standalone

Instantiate Logger directly with a writable resource and an optional minimum log level:

The second parameter sets the minimum log level. Messages below the minimum are silently discarded:

The default minimum level is debug, which passes all messages through.

With the Kernel

Add LoggerModule to your kernel to register Psr\Log\LoggerInterface as a shared service:

The minimum log level is resolved in this order:

  1. LOG_LEVEL environment variable, if set
  2. debug in Environment::Development
  3. info in all other environments

Overriding the binding

If you need a different logger implementation — a file-based logger, a test double, or a third-party PSR-3 library — define LoggerInterface in a module registered after LoggerModule:

The last definition wins, so LoggerModule does not need to be removed.

Log output

Each message is written as a single JSON object followed by a newline. The envelope always contains these fields:

Field Type Description
timestamp string RFC 3339 extended (e.g. 2026-06-10T14:32:01.123+00:00)
level string PSR-3 level name (debug, info, notice, warning, error, critical, alert, emergency)
severity string Reduced 4-value severity for structured log sinks (debug, info, warning, critical)
message string The log message
context object Contextual data; always present, empty object when no context is provided

Example output:

Severity mapping

PSR-3 defines 8 log levels. The severity field maps these to a reduced set aligned with common structured log sinks:

PSR-3 level Severity
emergency critical
alert critical
critical critical
error error
warning warning
notice info
info info
debug debug

The level field always carries the original PSR-3 value, so no information is lost.

Log levels

Valid levels in ascending severity order:

debug → info → notice → warning → error → critical → alert → emergency

An invalid level passed to either the constructor or log() throws \InvalidArgumentException.

License

MIT — see LICENSE.

All versions of logger with dependencies

PHP Build Version
Package Version
Requires php Version ^8.4
georgeff/kernel Version ^2.0
psr/log Version ^3.0
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