Neuron-PHP Logging

A flexible and powerful logging component for PHP 8.4+ applications, part of the Neuron-PHP framework.

Features

PSR-3 Compatible: Full PSR-3 logger interface with array contexts and message interpolation
Multiple Destinations: Write logs to files, console, Slack, webhooks, syslog, Nightwatch, and more
Flexible Formatting: Support for plain text, JSON, HTML, CSV, and custom formats
Log Levels: Full PSR-3 compliant log levels (debug, info, notice, warning, error, critical, alert, emergency)
Array Context Support: Pass complex arrays, objects, and exceptions as context
Message Interpolation: Use {placeholders} in messages for automatic substitution
Channels: Manage multiple independent loggers with automatic channel tracking
Filters: Apply custom filters to control which logs are written
Multiplexing: Write to multiple destinations simultaneously with different run levels
Exception Tracking: Automatic exception formatting with stack traces
Laravel Nightwatch: Forward logs into Laravel's existing nightwatch channel

Requirements

PHP 8.4 or higher
ext-curl (for webhook/Slack destinations)
ext-json (for JSON formatting)
ext-sockets (for socket destination)

Installation

Install via Composer:

composer require neuron-php/logging

Quick Start

The simplest way to start logging is using the singleton facade:

use Neuron\Log\Log;

// Set the minimum log level
Log::setRunLevel( 'debug' );

// Write log messages
Log::debug( 'Debug message' );
Log::info( 'Information message' );
Log::notice( 'Notice: user registration started' );
Log::warning( 'Warning message' );
Log::error( 'Error message' );
Log::critical( 'Critical: database connection lost' );
Log::alert( 'Alert: disk space critically low' );
Log::emergency( 'Emergency: system is shutting down' );

// With array context and interpolation (PSR-3 style)
Log::error( 'User {userId} failed login from {ip}', [
	'userId' => 12345,
	'ip' => '192.168.1.1',
	'attempts' => 3
] );

Destinations

The logging component supports writing to various destinations:

Available Destinations

Echo: Output to browser/console
Email: Send logs via email
File: Write to log files
Memory: Store logs in memory for testing
Nightwatch: Forward logs to Laravel's Nightwatch channel
Null: Discard logs (useful for testing)
Papertrail: Send to Papertrail cloud logging service
Slack: Post to Slack channels
Socket: Send over network sockets
Sqs: Send to Amazon SQS for queue-based processing
StdErr: Write to standard error
StdOut: Write to standard output
StdOutStdErr: Write to both stdout and stderr based on level
SysLog: System logging
Webhook: Send to custom webhooks
WebSocket: Stream logs in real-time via WebSocket

Formats

Each destination can use different formatting:

CSV: Comma-separated values
HTML: HTML formatted output
HTMLEmail: HTML optimized for emails
JSON: Structured JSON output
PlainText: Human-readable text format
Raw: Unformatted output
Slack: Slack-specific formatting

Usage Examples

Basic Logging

use Neuron\Log\Log;

// Configure run level
Log::setRunLevel( 'debug' );

// Simple logging
Log::debug( 'Debug information' );
Log::info( 'Application started' );
Log::warning( 'Memory usage high' );

// With array context
Log::error( 'Database connection failed', [
	'host' => 'db.example.com',
	'port' => 3306,
	'error' => 'Connection timeout'
] );

// With message interpolation
Log::info( 'User {user} performed {action}', [
	'user' => 'admin@example.com',
	'action' => 'delete_records',
	'count' => 42
] );

File Logging

use Neuron\Log\Logger;
use Neuron\Log\Destination\File;
use Neuron\Log\Format\PlainText;

// Create a file logger
$fileDestination = new File( new PlainText() );
$fileDestination->open( [ 'path' => '/var/log/app.log' ] );

$logger = new Logger( $fileDestination );
$logger->setRunLevel( 'info' );
$logger->info( 'Application event logged to file' );

JSON Logging

use Neuron\Log\Logger;
use Neuron\Log\Destination\File;
use Neuron\Log\Format\JSON;

// Log in JSON format for structured logging
$jsonDestination = new File( new JSON() );
$jsonDestination->open( [ 'path' => '/var/log/app.json' ] );

$jsonLogger = new Logger( $jsonDestination );

// Array context is automatically included in JSON output
$jsonLogger->error( 'Database error', [
	'query' => 'SELECT * FROM users',
	'error_code' => 1054,
	'duration' => 234.5
] );

Slack Integration

use Neuron\Log\Log;
use Neuron\Log\Logger;
use Neuron\Log\Destination\Slack;
use Neuron\Log\Format\SlackFormat;

$slack = new Slack( new SlackFormat() );
$slack->open( [
	'endpoint' => $_ENV['LOG_SLACK_WEBHOOK_URL'],
	'params' => [
		'channel'  => '#alerts',
		'username' => 'AppLogger',
		'icon_emoji' => ':warning:'
	]
] );

$slackLogger = new Logger( $slack );
$slackLogger->setRunLevel( 'error' );

// Add to the multiplexer
Log::getInstance()->Logger->addLog( $slackLogger );

// Now errors and above will also go to Slack with context
Log::error( 'Payment processing failed', [
	'transaction_id' => 'txn_12345',
	'amount' => 99.99,
	'currency' => 'USD'
] );

Laravel Nightwatch Integration

Use this when the Laravel application already runs Nightwatch. The destination forwards each Neuron record to Laravel's nightwatch log channel. Nightwatch's handler attaches the current request or job, and the local agent delivers it. There is no Nightwatch HTTP API to call, and no Nightwatch-specific formatter.

Pass the nightwatch channel. Do not pass stack or the default channel. If that default driver writes back into Neuron, a stack write recurses.

use Neuron\Log\Log;
use Neuron\Log\Logger;
use Neuron\Log\Destination\Nightwatch;
use Neuron\Log\Format\Raw;
use Illuminate\Support\Facades\Log as LaravelLog;

$destination = new Nightwatch( new Raw() );
$destination->open( [
	'logger' => LaravelLog::channel( 'nightwatch' )
] );

$nightwatchLogger = new Logger( $destination );
$nightwatchLogger->setRunLevel( 'info' );

Log::getInstance()->logger->addLog( $nightwatchLogger );

Log::info( 'User logged in', [ 'user_id' => 123 ] );
Log::error( 'Payment processing failed', [
	'transaction_id' => 'txn_abc123',
	'exception' => $exception
] );

Keep the Laravel setup you already have: LOG_STACK=single,nightwatch, the Nightwatch agent, and NIGHTWATCH_TOKEN.

Context is forwarded as given. Leave exception as a Throwable so Nightwatch can serialize it. user, request, and any other keys stay in the context array.

Channels

The Neuron channel name is copied into context under neuron_channel. Override that key with channel_key when calling open(). Laravel's Monolog channel name remains nightwatch. A logger stores one channel name, so give each Neuron channel its own logger:

$laravel = LaravelLog::channel( 'nightwatch' );

$audit = new Logger( new Nightwatch( new Raw() ) );
$audit->open( [ 'logger' => $laravel ] );
$audit->setRunLevel( 'info' );
Log::addChannel( 'audit', $audit );

Log::channel( 'audit' )->info( 'User updated profile', [ 'user_id' => 123 ] );
// Context includes neuron_channel=audit

Papertrail Integration

Papertrail is a cloud-based logging service that aggregates and centralizes logs from multiple sources. The Papertrail destination sends logs using the remote syslog protocol with optional TLS encryption.

use Neuron\Log\Logger;
use Neuron\Log\Destination\Papertrail;
use Neuron\Log\Format\PlainText;

// Create Papertrail destination
$papertrail = new Papertrail( new PlainText() );
$papertrail->open( [
	'host' => 'logs5.papertrailapp.com',  // Your Papertrail host
	'port' => 12345,                       // Your Papertrail port
	'system_name' => 'my-app-prod',        // Optional: System name (defaults to hostname)
	'use_tls' => true,                     // Optional: Use TLS encryption (default: true)
	'facility' => 16,                      // Optional: Syslog facility (default: 16 for local0)
	'sd_id' => 'mycompany@12345'          // Optional: Structured Data ID (default: 'neuron@32473')
] );

$papertrailLogger = new Logger( $papertrail );
$papertrailLogger->setRunLevel( 'info' );

// Logs are sent to Papertrail with structured data
$papertrailLogger->error( 'Payment processing failed', [
	'transaction_id' => 'txn_12345',
	'amount' => 99.99,
	'currency' => 'USD',
	'error_code' => 'INSUFFICIENT_FUNDS'
] );

// Context is included as structured data in syslog format
$papertrailLogger->info( 'User action', [
	'user_id' => 456,
	'action' => 'purchase',
	'items' => [ 'SKU-123', 'SKU-456' ]
] );

The Papertrail destination:

Sends logs using RFC 5424 syslog format over TCP/TLS
Automatically maps log levels to syslog severities
Includes context as structured data for easy filtering in Papertrail
Supports automatic reconnection if the connection is lost
Allows custom SD-ID for organizations with IANA Private Enterprise Numbers

Amazon SQS Integration

Send logs to Amazon SQS for scalable, queue-based processing:

use Neuron\Log\Logger;
use Neuron\Log\Destination\Sqs;
use Neuron\Log\Format\JSON;

// Create SQS destination
$sqs = new Sqs( new JSON() );
$sqs->open( [
	'queue_url' => 'https://sqs.us-east-1.amazonaws.com/123456789/my-log-queue',
	'region' => 'us-east-1',
	'credentials' => [                    // Optional: Use IAM role if not provided
		'key' => $_ENV['AWS_ACCESS_KEY'],
		'secret' => $_ENV['AWS_SECRET_KEY']
	],
	'batch_size' => 10,                   // Optional: Batch messages (1-10, default 1)
	'attributes' => [                     // Optional: Message attributes
		'Environment' => 'production',
		'Application' => 'neuron-app'
	],
	'max_retries' => 3,                   // Optional: Retry attempts (default 3)
	'retry_delay' => 1.0                  // Optional: Initial retry delay in seconds
] );

$sqsLogger = new Logger( $sqs );
$sqsLogger->setRunLevel( 'info' );

// Logs are sent to SQS with automatic batching
$sqsLogger->error( 'Critical system error', [
	'service' => 'payment-processor',
	'error_code' => 'GATEWAY_TIMEOUT',
	'retry_count' => 3
] );

// Context and channel are included in message body
$sqsLogger->info( 'Order processed', [
	'order_id' => 'ORD-12345',
	'amount' => 299.99,
	'items' => 5
] );

The SQS destination:

Sends logs as JSON messages to SQS queues
Supports batching up to 10 messages for improved performance
Automatic retry with exponential backoff
Message attributes for filtering and routing
Works with IAM roles or explicit credentials
Includes log level and channel as message attributes

Required: Install the AWS SDK via Composer:

composer require aws/aws-sdk-php

WebSocket Real-Time Streaming

Stream logs in real-time to web browsers or monitoring dashboards using WebSocket connections:

use Neuron\Log\Logger;
use Neuron\Log\Destination\WebSocket;
use Neuron\Log\Format\JSON;

// Create WebSocket destination
$websocket = new WebSocket( new JSON() );
$websocket->open( [
	'url' => 'ws://localhost:8080/logs',  // WebSocket server URL
	'max_reconnect_attempts' => 5,        // Optional: Max reconnection attempts (default: 5)
	'reconnect_delay' => 1.0              // Optional: Initial reconnect delay in seconds
] );

$wsLogger = new Logger( $websocket );
$wsLogger->setRunLevel( 'debug' );

// Logs are streamed in real-time to connected WebSocket clients
$wsLogger->info( 'Real-time event', [
	'event_type' => 'user_login',
	'user_id' => 123,
	'timestamp' => time()
] );

The WebSocket destination:

Maintains persistent WebSocket connections
Automatically reconnects with exponential backoff
Sends logs as WebSocket text frames
Perfect for real-time monitoring dashboards
Works with any WebSocket server implementation

Array Context Support (PSR-3 Compatible)

use Neuron\Log\Log;

// Pass array context as second parameter
Log::error( 'Database query failed', [
	'query' => 'SELECT * FROM orders WHERE id = ?',
	'params' => [12345],
	'duration' => 1234.5,
	'error' => 'Connection timeout'
] );

// Complex nested arrays
Log::info( 'Order processed', [
	'order' => [
		'id' => 'ORD-12345',
		'items' => [
			[ 'sku' => 'WIDGET-1', 'qty' => 2 ],
			[ 'sku' => 'GADGET-5', 'qty' => 1 ]
		],
		'total' => 149.99
	],
	'customer_id' => 789
] );

// Exception tracking with automatic formatting
try
{
	// some operation
}
catch( Exception $e )
{
	Log::error( 'Operation failed', [
		'exception' => $e,  // Stack trace automatically captured
		'operation' => 'process_payment',
		'user_id' => $userId
	] );
}

Message Interpolation

// Use {placeholders} in messages - PSR-3 style
Log::info( 'User {userId} logged in from {ip} at {time}', [
	'userId' => 12345,
	'ip' => '192.168.1.100',
	'time' => date( 'H:i:s' )
] );
// Output: User 12345 logged in from 192.168.1.100 at 14:30:45

// Interpolation works with all log levels
Log::error( 'Failed to send email to {email}: {error}', [
	'email' => 'user@example.com',
	'error' => 'SMTP connection refused',
	'retry_count' => 3
] );

Global and Local Context

use Neuron\Log\Log;

// Set global context that applies to all logs
Log::setContext( 'app_version', '2.0.0' );
Log::setContext( 'environment', 'production' );
Log::setContext( 'server', gethostname() );

// Can also set array values in global context
Log::setContext( 'tags', [ 'monitoring', 'production' ] );

// Local context in log call is merged with global
Log::info( 'User action', [
	'action' => 'profile_update',
	'user_id' => 456
] );
// Both global and local context are included

### Multiple Channels

```php
use Neuron\Log\Log;
use Neuron\Log\Logger;
use Neuron\Log\Destination\File;
use Neuron\Log\Destination\Slack;
use Neuron\Log\Format\PlainText;
use Neuron\Log\Format\SlackFormat;

// Create an audit logger
$auditFile = new File( new PlainText() );
$auditFile->open( [ 'path' => '/var/log/audit.log' ] );
$auditLogger = new Logger( $auditFile );

// Create a real-time alerts logger
$alertSlack = new Slack( new SlackFormat() );
$alertSlack->open( [
	'endpoint' => $_ENV['SLACK_WEBHOOK'],
	'params' => [ 'channel' => '#alerts' ]
] );
$alertLogger = new Logger( $alertSlack );

// Register channels
Log::addChannel( 'audit', $auditLogger );
Log::addChannel( 'alerts', $alertLogger );

// Use specific channels
Log::channel( 'audit' )->info( 'User login', [ 'user' => $username ] );
Log::channel( 'alerts' )->emergency( 'System down!' );

Multiplexer (Multiple Destinations)

use Neuron\Log\LogMux;
use Neuron\Log\Logger;
use Neuron\Log\Destination\File;
use Neuron\Log\Destination\StdErr;
use Neuron\Log\Format\PlainText;
use Neuron\Log\Format\JSON;

// Create multiple loggers
$fileLogger = new Logger( new File( new JSON() ) );
$fileLogger->getDestination()->open( [ 'path' => '/var/log/app.json' ] );
$fileLogger->setRunLevel( 'debug' );

$consoleLogger = new Logger( new StdErr( new PlainText() ) );
$consoleLogger->setRunLevel( 'warning' );

// Create multiplexer
$mux = new LogMux();
$mux->addLog( $fileLogger );
$mux->addLog( $consoleLogger );

// Logs go to both destinations based on their run levels
$mux->debug( 'Debug info' );     // Only to file
$mux->warning( 'Warning!' );     // To both file and console
$mux->error( 'Error occurred' ); // To both file and console

PSR-3 Adapter

The Neuron logging component provides a PSR-3 adapter that allows you to use Neuron loggers with any library or framework that expects a PSR-3 compliant logger (like Symfony, Laravel packages, Monolog alternatives, etc.).

Basic Usage

use Neuron\Log\Logger;
use Neuron\Log\Adapter\Psr3Adapter;
use Neuron\Log\Destination\File;
use Neuron\Log\Format\JSON;

// Create a Neuron logger
$destination = new File( new JSON() );
$destination->open( [ 'path' => '/var/log/app.json' ] );
$neuronLogger = new Logger( $destination );
$neuronLogger->setRunLevel( 'info' );

// Wrap it with the PSR-3 adapter
$psr3Logger = new Psr3Adapter( $neuronLogger );

// Now use it with any PSR-3 expecting code
$psr3Logger->info( 'Application started' );
$psr3Logger->error( 'Database connection failed', [
	'host' => 'db.example.com',
	'error' => 'Connection timeout'
] );

Framework Integration

The adapter makes it easy to integrate Neuron logging into frameworks that expect PSR-3:

use Neuron\Log\Log;
use Neuron\Log\Adapter\Psr3Adapter;

// Get Neuron's singleton logger and wrap it
$psr3Logger = new Psr3Adapter( Log::getInstance()->Logger );

// Use with Symfony components
$httpClient = new \Symfony\Component\HttpClient\CurlHttpClient( [
	'logger' => $psr3Logger
] );

// Use with Guzzle
$guzzleClient = new \GuzzleHttp\Client( [
	'handler' => $handlerStack,
	'logger' => $psr3Logger
] );

// Use with any PSR-3 compatible library
$thirdPartyService = new ThirdPartyService( $psr3Logger );

Level Mapping

The adapter automatically maps PSR-3 log levels to Neuron's RunLevel enum:

PSR-3 Level	Neuron RunLevel	Numeric Value
emergency	EMERGENCY	50
alert	ALERT	45
critical	CRITICAL	40
error	ERROR	30
warning	WARNING	20
notice	NOTICE	15
info	INFO	10
debug	DEBUG	0

Advanced Features

The adapter maintains full compatibility with Neuron's advanced features:

use Neuron\Log\Logger;
use Neuron\Log\Adapter\Psr3Adapter;
use Neuron\Log\Destination\File;
use Neuron\Log\Format\JSON;

// Create Neuron logger with multiple destinations
$fileLogger = new Logger( new File( new JSON() ) );
$fileLogger->getDestination()->open( [ 'path' => '/var/log/app.json' ] );

// Add filters, context, and other Neuron features
$fileLogger->setContext( 'app_version', '2.0.0' );
$fileLogger->setContext( 'environment', 'production' );

// Wrap with PSR-3 adapter
$psr3Logger = new Psr3Adapter( $fileLogger );

// PSR-3 calls use Neuron features underneath
$psr3Logger->warning( 'API rate limit approaching', [
	'requests' => 950,
	'limit' => 1000
] );
// Context includes: app_version, environment, requests, limit

// Access the underlying Neuron logger if needed
$neuronLogger = $psr3Logger->getNeuronLogger();
$neuronLogger->setRunLevel( 'debug' );

Why Use the Adapter?

Framework Integration: Use Neuron's powerful logging with any PSR-3 expecting library
Gradual Migration: Migrate from other PSR-3 loggers without changing application code
Best of Both Worlds: Keep Neuron's advanced features (multiple destinations, formats, filters) while maintaining PSR-3 compatibility
Drop-in Replacement: Works as a drop-in replacement for Monolog, PSR-3 Log, or other PSR-3 implementations

Custom Filters

use Neuron\Log\Logger;
use Neuron\Log\Filter\IFilter;
use Neuron\Log\RunLevel;

class ProductionFilter implements IFilter
{
	public function shouldLog( RunLevel $level, string $message, array $context ): bool
	{
		// Don't log debug messages in production
		if( $level === RunLevel::DEBUG && $_ENV['APP_ENV'] === 'production' )
		{
			return false;
		}

		// Don't log sensitive data
		if( str_contains( $message, 'password' ) || str_contains( $message, 'token' ) )
		{
			return false;
		}

		return true;
	}
}

$logger = new Logger( $destination );
$logger->addFilter( new ProductionFilter() );

Advanced Configuration

Environment-Based Configuration

use Neuron\Log\Log;
use Neuron\Log\Logger;
use Neuron\Log\Destination\File;
use Neuron\Log\Destination\StdOut;
use Neuron\Log\Format\JSON;
use Neuron\Log\Format\PlainText;

$environment = $_ENV['APP_ENV'] ?? 'development';

if( $environment === 'production' )
{
	// Production: JSON to file
	$destination = new File( new JSON() );
	$destination->open( [ 'path' => '/var/log/app.json' ] );
	$runLevel = 'warning';
}
else
{
	// Development: Plain text to console
	$destination = new StdOut( new PlainText( true ) );
	$runLevel = 'debug';
}

$logger = new Logger( $destination );
$logger->setRunLevel( $runLevel );

Log::getInstance()->Logger->addLog( $logger );

Testing with Memory Logger

use Neuron\Log\Logger;
use Neuron\Log\Destination\Memory;
use Neuron\Log\Format\Raw;

// For unit testing
$memoryDestination = new Memory( new Raw() );
$testLogger = new Logger( $memoryDestination );

$testLogger->error( 'Test error' );
$testLogger->info( 'Test info' );

// Retrieve logged messages
$logs = $memoryDestination->getLogs();
assert( count( $logs ) === 2 );
assert( $logs[0]['level'] === 'error' );

API Reference

Log Levels

The following PSR-3 compliant log levels are supported (from lowest to highest severity):

debug (0) - Detailed debug information for development and troubleshooting
info (10) - Informational messages about application flow
notice (15) - Normal but significant events
warning (20) - Warning messages about potentially harmful situations
error (30) - Error events that allow the application to continue running
critical (40) - Critical conditions that need immediate attention
alert (45) - Action must be taken immediately
emergency (50) - System is unusable, requires immediate intervention

Logger Methods

All logger methods accept an optional array context for additional data:

$logger->debug( string $message, array $context = [] );
$logger->info( string $message, array $context = [] );
$logger->notice( string $message, array $context = [] );
$logger->warning( string $message, array $context = [] );
$logger->error( string $message, array $context = [] );
$logger->critical( string $message, array $context = [] );
$logger->alert( string $message, array $context = [] );
$logger->emergency( string $message, array $context = [] );
$logger->log( string $message, RunLevel $level, array $context = [] );

// Set minimum log level
$logger->setRunLevel( mixed $level );           // Accepts RunLevel enum or string
$logger->setRunLevelText( string $level );      // Set by text: 'debug', 'info', etc.
$logger->getRunLevel(): RunLevel;               // Get current run level

// Context management
$logger->setContext( string $name, mixed $value );  // Add global context
$logger->getContext(): array;                       // Get all context
$logger->reset();                                   // Clear all context

Testing

Run the test suite:

./vendor/bin/phpunit tests

Run tests with coverage:

./vendor/bin/phpunit tests --coverage-text

Contributing

Contributions are welcome! Please ensure all tests pass and maintain code coverage above 95%.

License

MIT License - see LICENSE file for details.

More Information

Full documentation: neuronphp.com
GitHub: github.com/neuron-php/logging
Issues: github.com/neuron-php/logging/issues

Name		Name	Last commit message	Last commit date
.github/workflows		.github/workflows
examples		examples
src/Log		src/Log
tests		tests
.editorconfig		.editorconfig
.gitignore		.gitignore
.version.json		.version.json
LICENSE		LICENSE
README.md		README.md
VERSIONLOG.md		VERSIONLOG.md
composer.json		composer.json

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