WP Logger

A comprehensive WordPress logging service with Wonolog integration, secure file logging, multi-server protection, and environment-based configuration.

Features

• PSR-3 Compatibility: Full implementation of PSR-3 LoggerInterface for standardized logging
• Environment-Based Configuration: Powered by WP Env for flexible configuration management
• Wonolog Integration: Automatic detection and seamless integration with Wonolog
• Secure File Logging: WordPress.org compliant fallback logging with multi-server protection
• Multi-Server Protection: Built-in protection files for Apache, Nginx, IIS, LiteSpeed, and more
• Configurable Log Levels: Minimum log level filtering with environment variable support
• Intelligent Log Retention: Environment-specific retention policies with automatic cleanup
• Hook System: Extensible architecture with WordPress hooks for customization
• Debug Mode Support: Intelligent handling of development vs production environments
• Zero Dependencies: Works with or without external logging libraries, with automatic fallback to native file-based logging
• Plugin Isolation: Each plugin/theme gets independent log directories and settings

Design Philosophy: Mixed Types for Maximum Flexibility

WP Logger intentionally uses mixed type hints throughout its API, diverging from strict PSR Log ^2.0+ signatures. This design choice aligns with our primary integration target and WordPress ecosystem philosophy:

Why Mixed Types?

Wonolog Compatibility: Our primary target, Wonolog, accepts truly mixed types natively (Throwable, Arrays, Objects, WP_Error):

// Wonolog native usage
do_action('wonolog.log', $exception);        // ✅ Throwable
do_action('wonolog.log', ['data' => 'log']); // ✅ Array  
do_action('wonolog.log', $wpError);          // ✅ WP_Error

PSR Log Version Differences:

• PSR Log ^1.0: Uses mixed type hint but primarily expects strings
• PSR Log ^2.0+: Strictly enforces string|\Stringable only

WordPress Ecosystem: WordPress prioritizes pragmatism and developer experience over strict typing. Our design reflects this philosophy.

Developer Benefits

// ✅ Natural and intuitive - all supported
$logger->error($exception);              // Throwable objects
$logger->warning($wpError);              // WP_Error objects
$logger->info(['user' => 123]);          // Structured data
$logger->debug($customObject);           // Any object

// vs. ❌ Verbose PSR ^2.0+ requirement
$logger->error($exception->getMessage(), ['exception' => $exception]);

How It Works

• With Wonolog: Mixed types passed through natively without conversion
• Fallback Mode: Mixed types converted to strings via formatMessage()
• Best of Both: WordPress flexibility + PSR compatibility + Wonolog power

This approach ensures zero breaking changes while maximizing compatibility across the WordPress ecosystem.

Installation

Install via Composer:

composer require wp-spaghetti/wp-logger

Quick Start

1. Basic Usage

<?php
use WpSpaghetti\WpLogger\Logger;

// Initialize with minimal configuration
$logger = new Logger([
    'component_name' => 'my-awesome-plugin'
]);

// Standard PSR-3 logging methods
$logger->info('Plugin initialized successfully');
$logger->error('Something went wrong', ['error_code' => 500]);
$logger->debug('Debug information', ['user_id' => 123]);

2. Environment-Based Configuration

<?php
use WpSpaghetti\WpLogger\Logger;

// Configuration can come from environment variables via WP Env
$logger = new Logger([
    'component_name' => 'my-plugin',
    'retention_days' => 60, // Can be overridden by LOGGER_RETENTION_DAYS env var
    'min_level' => 'info',  // Can be overridden by LOGGER_MIN_LEVEL env var
]);

// Logging behavior:
// - If Wonolog is available: uses Wonolog for advanced logging
// - If Wonolog not available: uses fallback (error_log in debug/dev, file logging in production)
$logger->debug('Debug information');
$logger->info('Informational message');
$logger->warning('Warning message');
$logger->error('Error occurred');

3. WordPress Integration

<?php
// In your plugin main file
use WpSpaghetti\WpLogger\Logger;

class MyPlugin 
{
    private Logger $logger;
    
    public function __construct() 
    {
        $this->logger = new Logger([
            'component_name' => 'my-plugin',
            'retention_days' => 30
        ]);
        
        add_action('init', [$this, 'init']);
    }
    
    public function init(): void 
    {
        $this->logger->info('Plugin initialized');
        
        // Your plugin logic here...
        try {
            $this->doSomething();
        } catch (\Exception $exception) {
            $this->logger->error('Operation failed', [
                'exception' => $exception
            ]);
        }
    }
}

Configuration

WP Logger v2.0 supports multiple configuration sources with intelligent priority:

Configuration Priority (Highest to Lowest)

1. Plugin-specific Environment Variables (MY_PLUGIN_*)
2. Global Logger Environment Variables (LOGGER_*)
3. WordPress Constants (wp-config.php)
4. Configuration Array (passed to constructor)
5. Default Values

Configuration Array Options

$config = [
    // Required: Unique identifier for your plugin/theme
    'component_name' => 'my-plugin',
    
    // Optional: Days to keep log files (default: 30)
    'retention_days' => 60,
    
    // Optional: Minimum log level to record (default: 'debug')
    'min_level' => 'info',
    
    // Optional: Wonolog namespace (default: 'Inpsyde\Wonolog')
    'wonolog_namespace' => 'MyApp\Wonolog',
    
    // Optional: WordPress constant to disable logging
    // (default: auto-generated from component_name)
    'disabled_constant' => 'MY_PLUGIN_LOGGER_DISABLED',
    
    // Optional: WordPress constant for retention days
    // (default: auto-generated from component_name)
    'retention_days_constant' => 'MY_PLUGIN_LOGGER_RETENTION_DAYS'
];

Environment Variables (via WP Env)

# Global logger settings
LOGGER_COMPONENT_NAME=my-plugin        # Plugin/Theme identifier
LOGGER_RETENTION_DAYS=30               # Log retention period
LOGGER_MIN_LEVEL=info                  # Minimum log level
LOGGER_DISABLED=false                  # Disable all logging
LOGGER_WONOLOG_NAMESPACE=Inpsyde\Wonolog

# Plugin-specific settings (higher priority)
MY_PLUGIN_LOGGER_RETENTION_DAYS=60
MY_PLUGIN_LOGGER_DISABLED=false
MY_PLUGIN_LOGGER_MIN_LEVEL=warning

WordPress Constants (wp-config.php)

// Control logging behavior per plugin
define('MY_PLUGIN_LOGGER_DISABLED', true);      // Disable all logging
define('MY_PLUGIN_LOGGER_RETENTION_DAYS', 90);     // Keep logs for 90 days

// Global WordPress debug (affects fallback behavior)
define('WP_DEBUG', true);  // Forces error_log() usage in fallback mode

Logging Behavior

WP Logger uses a simple, reliable logging strategy:

1. With Wonolog Available: Uses Wonolog for advanced logging features, routing, and formatting
2. Without Wonolog (Fallback):
   • Development/Debug Mode: Logs go to PHP error_log for immediate developer feedback
   • Production Mode: Logs go to secure files in WordPress uploads directory
   • Disabled Mode: Only hooks are triggered (no actual logging)

Environment Detection for Fallback Logging

When Wonolog is not available, WP Logger adapts its fallback behavior:

Development/Debug Environment

• Detection: WP_DEBUG=true or WP_ENVIRONMENT_TYPE=development
• Behavior: Uses PHP error_log for immediate developer feedback
• Format: Includes environment tags for context
• Performance: Optimized for debugging with detailed context

Production Environment

• Detection: WP_DEBUG=false and WP_ENVIRONMENT_TYPE=production
• Behavior: Uses secure file logging with WordPress-compliant protection
• Format: Minimal overhead, performance-optimized
• Security: Protected directories with multi-server support

File Structure

WP Logger creates the following structure:

wp-content/uploads/
└── my-plugin/
    ├── index.php              # Directory protection
    └── logs/
        ├── .htaccess          # Apache protection
        ├── web.config         # IIS protection  
        ├── index.php          # Universal protection
        ├── README             # Server configuration guide
        ├── 2024-01-15_a1b2c3d4.dat
        └── 2024-01-16_a1b2c3d4.dat

API Reference

Core Methods

__construct(array $config = [])

Initialize logger with configuration options.

log($level, $message, array $context = []): void

Log message with arbitrary level (PSR-3 interface).

PSR-3 Log Level Methods

• emergency($message, array $context = []): void
• alert($message, array $context = []): void
• critical($message, array $context = []): void
• error($message, array $context = []): void
• warning($message, array $context = []): void
• notice($message, array $context = []): void
• info($message, array $context = []): void
• debug($message, array $context = []): void

Utility Methods

getWonologLogger(): ?LoggerInterface

Get Wonolog logger instance if available.

refreshWonologCache(): void

Force refresh Wonolog availability cache.

getDebugInfo(): array

Get comprehensive debug information for troubleshooting.

getConfig(): array

Get current logger configuration.

Examples

Plugin Integration

<?php
/*
Plugin Name: My Awesome Plugin
Version: 1.0.0
*/

use WpSpaghetti\WpLogger\Logger;

class MyAwesomePlugin 
{
    private Logger $logger;
    
    public function __construct() 
    {
        $this->logger = new Logger([
            'component_name' => 'my-awesome-plugin',
            'retention_days' => 30
        ]);
        
        register_activation_hook(__FILE__, [$this, 'activate']);
        register_deactivation_hook(__FILE__, [$this, 'deactivate']);
        
        add_action('plugins_loaded', [$this, 'init']);
    }
    
    public function activate(): void 
    {
        $this->logger->info('Plugin activated', ['version' => '1.0.0']);
    }
    
    public function deactivate(): void 
    {
        $this->logger->info('Plugin deactivated');
    }
    
    public function init(): void 
    {
        $this->logger->debug('Plugin initialization started');
        
        // Your plugin logic...
        
        $this->logger->info('Plugin fully initialized');
    }
}

new MyAwesomePlugin();

Theme Integration

<?php
// In functions.php

use WpSpaghetti\WpLogger\Logger;

$theme_logger = new Logger([
    'component_name' => get_template(),
    'retention_days' => 14
]);

// Log theme setup
add_action('after_setup_theme', function() use ($theme_logger) {
    $theme_logger->info('Theme setup completed', [
        'theme' => get_template(),
        'version' => wp_get_theme()->get('Version')
    ]);
});

// Log template loading for debugging
add_action('template_redirect', function() use ($theme_logger) {
    global $template;
    $theme_logger->debug('Template loaded', [
        'template' => basename($template),
        'query_vars' => get_query_var('all')
    ]);
});

Error Handling Integration

<?php
use WpSpaghetti\WpLogger\Logger;

class ErrorHandler 
{
    private Logger $logger;
    
    public function __construct() 
    {
        $this->logger = new Logger(['component_name' => 'error-handler']);
        
        // Hook into WordPress error handling
        add_action('wp_die_handler', [$this, 'handle_wp_die']);
        set_error_handler([$this, 'handle_php_error']);
        set_exception_handler([$this, 'handle_exception']);
    }
    
    public function handle_wp_die($message): void 
    {
        $this->logger->critical('WordPress died', ['message' => $message]);
    }
    
    public function handle_php_error($severity, $message, $file, $line): bool 
    {
        $this->logger->error('PHP Error', [
            'severity' => $severity,
            'message' => $message,
            'file' => basename($file),
            'line' => $line
        ]);
        
        return false; // Let PHP handle it too
    }
    
    public function handle_exception(\Throwable $exception): void 
    {
        $this->logger->critical('Uncaught Exception', [
            'exception' => $exception
        ]);
    }
}

Environment-Aware Plugin

<?php
/*
Plugin Name: Environment-Aware Plugin
Version: 2.0.0
*/

use WpSpaghetti\WpLogger\Logger;

class EnvironmentAwarePlugin 
{
    private Logger $logger;
    
    public function __construct() 
    {
        // Logger automatically detects environment via WP Env
        $this->logger = new Logger();
        
        register_activation_hook(__FILE__, [$this, 'activate']);
        add_action('plugins_loaded', [$this, 'init']);
    }
    
    public function activate(): void 
    {
        $debugInfo = $this->logger->getDebugInfo();
        
        $this->logger->info('Plugin activated', [
            'environment' => $debugInfo['environment_type'],
            'is_container' => $debugInfo['is_container'],
            'server' => $debugInfo['server_software']
        ]);
    }
    
    public function init(): void 
    {
        $debugInfo = $this->logger->getDebugInfo();
        
        if ($debugInfo['is_development']) {
            // Development-specific initialization
            $this->enableDebugMode();
            $this->logger->debug('Plugin initialized in development mode');
        } elseif ($debugInfo['is_staging']) {
            // Staging-specific initialization
            $this->enableStagingFeatures();
            $this->logger->info('Plugin initialized in staging mode');
        } else {
            // Production initialization
            $this->enableProductionOptimizations();
            $this->logger->notice('Plugin initialized in production mode');
        }
    }
    
    private function enableDebugMode(): void 
    {
        // Enable verbose logging, profiling, etc.
        $this->logger->debug('Debug mode enabled');
    }
    
    private function enableStagingFeatures(): void 
    {
        // Enable testing features, disable emails, etc.
        $this->logger->info('Staging features enabled');
    }
    
    private function enableProductionOptimizations(): void 
    {
        // Enable caching, disable debug features, etc.
        $this->logger->notice('Production optimizations enabled');
    }
}

new EnvironmentAwarePlugin();

Hook System

WP Logger provides several hooks for customization:

Override Logging Behavior

// Completely override logging (return non-null to prevent default logging)
add_filter('wp_logger_override_log', function($result, $level, $message, $context, $config) {
    // Custom logging implementation
    my_custom_logger($level, $message, $context);
    return true; // Prevent default logging
}, 10, 5);

Customize Wonolog Integration

// Change Wonolog namespace
add_filter('wp_logger_wonolog_namespace', function($namespace) {
    return 'MyApp\Logger';
});

// Modify Wonolog prefix
add_filter('wp_logger_wonolog_prefix', function($prefix, $level, $message, $context, $config) {
    return 'myapp.log';
}, 10, 5);

// Customize Wonolog action name
add_filter('wp_logger_wonolog_action', function($action, $level, $message, $context, $config) {
    return 'custom.log.' . $level;
}, 10, 5);

Hook Into Logging Events

// React to all log entries
add_action('wp_logger_logged', function($level, $message, $context, $component_name) {
    // Send critical errors to external monitoring
    if ($level === 'critical') {
        send_to_monitoring_service($message, $context);
    }
}, 10, 4);

// Handle fallback logging
add_action('wp_logger_fallback', function($level, $message, $context, $component_name) {
    // Custom fallback when Wonolog is not available
}, 10, 4);

// Hook into specific log levels during fallback
add_action('wp_logger_fallback_error', function($message, $context, $component_name) {
    // Handle error-level logs specifically
}, 10, 3);

Multi-Server Protection

WP Logger automatically creates protection files for various web servers:

• Apache: .htaccess files
• Nginx: Configuration examples in README
• IIS: web.config files
• LiteSpeed: .htaccess compatible
• Universal: index.php protection files

Manual Server Configuration

For Nginx, add to your server configuration:

# Block access to WP Logger files
location ~* /wp-content/uploads/.*/logs/ {
    deny all;
    return 403;
}

Troubleshooting

Debug Information

// Get comprehensive debug info
$debugInfo = $logger->getDebugInfo();
var_dump($debugInfo);

Common Issues

Logs not appearing:

• Check if WP_DEBUG is enabled for immediate error_log output
• Verify the disable logging constant is not set
• Ensure WordPress upload directory is writable

Wonolog not detected:

• Verify Wonolog is properly installed and activated
• Check the Wonolog namespace configuration
• Use refreshWonologCache() if Wonolog state changes

File permissions:

• WordPress upload directory must be writable
• Log files are created with restrictive permissions automatically

Requirements

• PHP 8.0 or higher
• WordPress 5.0 or higher
• PSR Log 1.0|2.0|3.0 for interface compatibility
• WP Env 2.0+ for environment management
• Optional: Wonolog for advanced logging

Changelog

Please see CHANGELOG for a detailed list of changes for each release.

We follow Semantic Versioning and use Conventional Commits to automatically generate our changelog.

Release Process

• Major versions (1.0.0 → 2.0.0): Breaking changes
• Minor versions (1.0.0 → 1.1.0): New features, backward compatible
• Patch versions (1.0.0 → 1.0.1): Bug fixes, backward compatible

All releases are automatically created when changes are pushed to the main branch, based on commit message conventions.

Contributing

For your contributions please use:

• Conventional Commits
• git-flow workflow
• Pull request workflow

See CONTRIBUTING for detailed guidelines.

Sponsor

License

(ɔ) Copyleft 2025 Frugan.
GNU GPLv3, see LICENSE file.