pop-log

OVERVIEW

pop-log is a logging component that provides a way of logging events following the standard BSD syslog protocol outlined in RFC-3164. Support is built-in for writing log messages to a file or database table or deploying them via email. The eight available log message severity values are:

• EMERG (0)
• ALERT (1)
• CRIT (2)
• ERR (3)
• WARN (4)
• NOTICE (5)
• INFO (6)
• DEBUG (7)

and are available via their respective methods:

• $log->emergency($message);
• $log->alert($message);
• $log->critical($message);
• $log->error($message);
• $log->warning($message);
• $log->notice($message);
• $log->info($message);
• $log->debug($message);

pop-log is a component of the Pop PHP Framework.

INSTALL

Install pop-log using Composer.

composer require popphp/pop-log

Or, require it in your composer.json file

"require": {
    "popphp/pop-log" : "^4.0.0"
}

BASIC USAGE

Using a Log File

Setting up and using a log file is pretty simple. Plain text is the default, but there is also support for CSV, TSV and XML formats:

use Pop\Log\Logger;
use Pop\Log\Writer;

$log = new Logger(new Writer\File(__DIR__ . '/logs/app.log'));

$log->info('Just a info message.');
$log->alert('Look Out! Something serious happened!');

Then, your 'app.log' file will contain:

2015-07-11 12:32:32    6    INFO    Just a info message.
2015-07-11 12:32:33    1    ALERT   Look Out! Something serious happened!

Using Email

Here's an example using email, which requires you to install popphp/pop-mail:

use Pop\Log\Logger;
use Pop\Log\Writer;
use Pop\Mail;

$mailer = new Mail\Mailer(new Mail\Transport\Sendmail());
$log    = new Logger(new Writer\Mail($mailer, [
    'sysadmin@mydomain.com', 'logs@mydomain.com'
]));

$log->info('Just a info message.');
$log->alert('Look Out! Something serious happened!');

Then the emails listed above will receive a series of emails like this:

Subject: Log Entry: INFO (6)
2015-07-11 12:32:32    6    INFO    Just a info message.

and

Subject: Log Entry: ALERT (1)
2015-07-11 12:32:33    1    ALERT   Look Out! Something serious happened!

Using an HTTP Service

Here's an example using an HTTP service:

use Pop\Log\Logger;
use Pop\Log\Writer;
use Pop\Http\Client;

$stream = new Client\Stream('http://logs.mydomain.com/');
$log    = new Logger(new Writer\Http($stream);

$log->info('Just a info message.');
$log->alert('Look Out! Something serious happened!');

The log writer will send HTTP requests with the log data to the HTTP service.

Using a Database Table

Writing a log to a table in a database requires you to install popphp/pop-db:

use Pop\Db\Db;
use Pop\Log\Logger;
use Pop\Log\Writer;

$db  = Db::connect('sqlite', __DIR__ . '/logs/.htapplog.sqlite');
$log = new Logger(new Writer\Db($db, 'system_logs'));

$log->info('Just a info message.');
$log->alert('Look Out! Something serious happened!');

In this case, the logs are written to a database table that has the columns id, timestamp, level, name and message. So, after the example above, your database table would look like this:

Setting Log Limits

Log level limits can be set for the log writer objects to enforce the severity of which log messages actually get logged:

use Pop\Log\Logger;
use Pop\Log\Writer;

$prodLog = new Writer\File(__DIR__ . '/logs/app_prod.log');
$devLog  = new Writer\File(__DIR__ . '/logs/app_dev.log');

$prodLog->setLogLimit(3); // Log only ERROR (3) and above
$devLog->setLogLimit(6);  // Log only INFO (6) and above

$log = new Logger([$prodLog, $devLog]);

$log->alert('Look Out! Something serious happened!'); // Will write to both writers
$log->info('Just a info message.');                   // Will write to only app_dev.log

The app_prod.log file will contain:

2015-07-11 12:32:33    1    ALERT   Look Out! Something serious happened!

And the app_dev.log file will contain:

2015-07-11 12:32:33    1    ALERT   Look Out! Something serious happened!
2015-07-11 12:32:34    6    INFO    Just a info message.