// Import the JLog library jimport('joomla.log.log'); // Create the JLog instance $log = JLog::getInstance('mylog'); // Add information to log $log->addEntry(array('message' => 'This is a log message', 'level' => JLog::INFO));In this example, the JLog library is imported using `jimport()` function. The `getInstance()` method is used to create an instance of the JLog class with the log file name 'mylog'. The `addEntry()` method is called to add a log message to the log file with the INFO log level. JLog is a package library of Joomla that comes with Joomla's framework. It can be used by Joomla extensions with few lines of code to log activities of the extension.