Logger is a PHP text file logging facility, implemented as a singleton. It's nothing special, but I'm breaking a larger code base down into independent components and I needed this to be in its own repository.

Implementing Logger in 4 easy steps:

1. Either composer require parseword/logger or copy the Logger.php file into your project.

2. Make sure Logger.php is discoverable by your autoloader, or require_once it manually.

3. Throughout your application code, call Logger::debug(), Logger::info(), Logger::warning() and Logger::error() to send log messages of differing severity levels.

4. In your application's config file or a common include file, you (or the user) call Logger::setFilename() to set the log file, and Logger::setSeverityFilter() to specify which log messages are written to disk.

In the following example, a file named /tmp/my.log is created. The severity filter is set so that only messages with severity of WARNING or higher will be written. Messages with lower severity will be disregarded.

<?php
//Set up the logger in your config or global include file
use parseword\logger\Logger;
Logger::setFilename('/tmp/my.log');
Logger::setSeverityFilter(Logger::SEVERITY_WARNING);
Logger::setLabel('myCoolApp');

//Call the static Logger methods throughout your application code
Logger::info("Somebody set us up the bomb.");
Logger::debug("Main screen turn on.");
Logger::warning("All your base are belong to us.");
Logger::info("You have no chance to survive make your time.");
Logger::error("Unable to move 'ZIG', aborting");

The contents of /tmp/my.log will look like this:

[2019-01-25,14:40:13.797 CST]  WARN: myCoolApp: All your base are belong to us.
[2019-01-25,14:40:13.797 CST] ERROR: myCoolApp: Unable to move 'ZIG', aborting

Inspect or run the included test.php file for more examples.

These methods are used to configure the Logger:

• setCollapseEntries() - Whether or not to replace newlines in log entries with spaces, constraining each entry to a single line. Defaults to true.

• setDateFormat() - Set the date format to use when stamping log messages.

• setFilename() - Set the filesystem path and filename for the log file.

• setLabel() - Set an optional text string to include in log messages. If each instance of your application has a unique ID, setting it here can help with tracing and troubleshooting.

• setSeverityFilter() - Set which types of log messages are written to the file.

These methods control the logger's functionality:

• debug() - Send a log message of severity DEBUG.

• error() - Send a log message of severity ERROR.

• warning() - Send a log message of severity WARNING.

• info() - Send a log message of severity INFO.

• truncate() - Truncate the log file, wiping out any previous entries.

The Logger class requires PHP7 to support scalar type declarations.

None at this time.