Documentation

Queasy PHP Framework - Logger

Package v-dem/queasy-log

Contains logger classes compatible with PSR-3 logger interface. Currently file system and console loggers are implemented. This package includes these types of logging:

• Logger (base class, can be used as a container for other loggers)
• FileSystemLogger
• ConsoleLogger (supports ANSI color codes)
• SimpleMailLogger (encapsulates `mail()` function)

Features

• PSR-3 compatible.
• Easy to use.
• Easy to extend.
• Nested loggers support.
• Configurable output message format.

Requirements

• PHP version 5.3 or higher

Documentation

See our Wiki page.

Installation

composer require v-dem/queasy-log:master-dev

Usage

Let's imagine we have the following config.php:

return [
    'logger' => [
        'class' => queasy\log\FileSystemLogger::class, // Logger class
        'processName' => 'test', // Process name, to differentiate log messages from different sources
        'minLevel' => Psr\Log\LogLevel::WARNING, // Message's minimum acceptable log level
        'path' => 'debug.log' // Path to logger output file
    ]
];

Creating logger instance

Include Composer autoloader:

require_once('vendor/autoload.php');

Create config instance (using v-dem/queasy-config package):

$config = new queasy\config\Config('config.php');

Or using arrays:

$config = include('config.php');

Create logger instance (in this case class option can be omitted and will be ignored):

$logger = new queasy\log\Logger($config);

Another way to create logger instance (it will create an instance of $config->logger->class, by default queasy\log\Logger as an aggregate logger will be used):

$logger = queasy\log\Logger::create($config);

> FileSystemLogger and ConsoleLogger have default settings and can be used without config. Default log file path for > FileSystemLogger is debug.log, default min log level is Psr\Log\LogLevel::DEBUG and max is LogLevel::EMERGENCY.

Writing messages to log

Output warning message:

$logger->warning('Test warning message.');

In debug.log you'll see something like this:

2017-12-24 16:13:09.302334 EET test [] [] [WARNING] Test warning message.

Chain log messages

$logger
    ->warning('going strange')
    ->error('cannot connect to the database')
    ->emergency('the website is down');

Using composite/nested loggers

config.php:

return [
    [
        'class' => queasy\log\FileSystemLogger::class,
        'path' => 'debug.full.log',
        'minLevel' => Psr\Log\LogLevel::DEBUG,
        [
            'class' => queasy\log\ConsoleLogger::class,
            'minLevel' => Psr\Log\LogLevel::INFO
        ], [
            'class' => queasy\log\SimpleMailLogger::class,
            'minLevel' => Psr\Log\LogLevel::ALERT,
            'mailTo' => 'john.doe@example.com',
            'subject' => 'Website Alert'
        ]
    ], [
        'class' => queasy\log\FileSystemLogger::class,
        'path' => 'debug.log',
        'minLevel' => Psr\Log\LogLevel::INFO
    ]
];

Usage:

$config = new queasy\config\Config('config.php');
$logger = new queasy\log\Logger($config);
$logger->info('Hello, world!');

Using date/time in log file name (note "%s" there, it will be replaced by current date and/or time formatted as described in timeLabel)

config.php:

return [
    [
        'class' => queasy\log\FileSystemLogger::class,
        'path' => 'debug-full.%s.log',
        'timeLabel' => 'Y-m-d',
        'minLevel' => Psr\Log\LogLevel::DEBUG
    ]
];