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Example code of vista-php/logger

Informations about the package logger

vista-php/logger

Latest Version PHP Version License CI

PSR-3 compliant logging package for PHP 8.3+.

Designed for clean architecture, strict correctness, and framework-quality maintainability.

No hidden state. No speculative abstractions. Explicit, configurable failure semantics.

Table of Contents

Philosophy

vista-php/logger is a minimal, infrastructure-level logging foundation.

It strictly implements the PSR-3 contract while enforcing clear architectural boundaries:

The package prioritizes clarity, determinism, and explicit behavior over feature breadth.

Features

Requirements

Tested against PHP 8.3, 8.4, and 8.5.

Installation

Architecture Overview

The logging pipeline is intentionally simple and explicit:

Core Principles

Basic Usage

Log Levels

All PSR-3 log levels are supported:

Invalid levels throw InvalidArgumentException immediately, even if no handlers are registered.

Validation occurs at the Logger API boundary.

LogRecord

Each log entry is represented by an immutable LogRecord:

Records are created exclusively by the Logger and passed to handlers. They are treated as immutable data carriers.

Multiple Handlers

You may register multiple handlers:

Execution Semantics

Handlers are executed sequentially.

If any handler throws an exception:

This behavior is intentional and aligns with the fail-fast design philosophy.

Handlers

StreamHandler

Writes log records to a file or stream.

Note: File locking relies on underlying filesystem semantics Behavior may vary on certain network filesystems.

Custom Formatter

You can provide a custom formatter implementation:

Any implementation of FormatterInterface can be injected.

Failure Strategies

By default, write failures are reported via error_log() and do not interrupt application flow.

You can use StrictFailureStrategy to throw a RuntimeException on write failures:

Failure handling is explicit and local to each handler.

NullHandler

Discards all log records (Null Object pattern).

Useful for testing or conditional logging.

Formatters

LineFormatter (default)

Human-readable single-line output:

Characteristics:

JsonFormatter

Machine-friendly structured logging:

Characteristics:

Message Interpolation

PSR-3 style placeholder replacement:

Failure Semantics

Design Decisions

This package intentionally avoids:

The goal is a clean, extensible foundation that can be composed into larger systems without architectural debt.

Testing Philosophy

Versioning

This package adheres to Semantic Versioning (SemVer).

Why not Monolog?

monolog/monolog is a powerful, feature-rich logging library and the ecosystem standard. If you need dozens of handlers, complex pipelines, buffering strategies, or broad integrations, Monolog is an excellent choice.

vista-php/logger is intentionally different.

It provides a strict, minimal PSR-3 implementation focused on architectural clarity, immutable log records, explicit failure semantics, and a small, predictable surface area. There are no channels, no buffering layers, no hidden processors, and no speculative abstractions.

Choose Monolog for ecosystem breadth. Choose vista-php/logger for a clean, framework-grade logging foundation with explicit behavior and minimal complexity.

License

MIT

Contributing

Contributions are welcome, but this package is intentionally minimal and opinionated.

Before opening a pull request, please ensure:

Non-Goals

The following will not be accepted:

If you need these features, consider composing this package or using monolog/monolog.

Development Setup

All versions of logger with dependencies

PHP Build Version
Package Version
Requires php Version ^8.3
psr/log Version ^3.0
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