PHP Logging - Zend_Log

Zend_Log provides a very convenient mechanism for keeping track of particular events when they occur in application code.

I tend to use a singleton pattern-based Logger class and then typically call a static logMessage() method directly.

Alternatively, calling the static instance() method returns the Logger, providing additional flexibility (e.g., customise setEventItem() calls on Zend_Log object).

Zend_Registry is being used to hold some values set during initialization of the application.

<?php
 
class Logger
{
    private static $instance;
    private $logger;
 
    public static function instance()
    {
        if(!self::$instance)
        {
            self::$instance = new self();
 
            $formatter = new Zend_Log_Formatter_Xml();
 
            $filter = new Zend_Log_Filter_Priority(Zend_Registry::get('logFilterLevel'));
 
            $writer = new Zend_Log_Writer_Stream(Zend_Registry::get('logFileLocation'));
            $writer->setFormatter($formatter);
            $writer->addFilter($filter);
 
            self::$instance->logger = new Zend_Log($writer);
        }
        
        return self::$instance;
    }
 
    public static function logMessage($message=null, $priorityLevel=null, Exception $exception)
    {
        $logger = self::instance()->logger;
 
        $logger->setEventItem('exceptionCode', $exception->getCode());
        $logger->setEventItem('file', $exception->getFile());
        $logger->setEventItem('line', $exception->getLine());
        $logger->setEventItem('exceptionMessage', $exception->getMessage());
        $logger->setEventItem('exceptionTrace', serialize($exception->getTrace()));
        $logger->setEventItem('exceptionTraceAsString', $exception->getTraceAsString());
        
        $logger->log($message, $priorityLevel);
    }
 
}
 
?> 

1. <?php
2.  
3. class Logger
4. {
5. private static $instance;
6. private $logger;
8. public static function instance()
9. {
10. if(!self::$instance)
11. {
12. self::$instance = new self();
14. $formatter = new Zend_Log_Formatter_Xml();
16. $filter = new Zend_Log_Filter_Priority(Zend_Registry::get('logFilterLevel'));
18. $writer = new Zend_Log_Writer_Stream(Zend_Registry::get('logFileLocation'));
19. $writer->setFormatter($formatter);
20. $writer->addFilter($filter);
22. self::$instance->logger = new Zend_Log($writer);
23. }
25. return self::$instance;
26. }
28. public static function logMessage($message=null, $priorityLevel=null, Exception $exception)
29. {
30. $logger = self::instance()->logger;
32. $logger->setEventItem('exceptionCode', $exception->getCode());
33. $logger->setEventItem('file', $exception->getFile());
34. $logger->setEventItem('line', $exception->getLine());
35. $logger->setEventItem('exceptionMessage', $exception->getMessage());
36. $logger->setEventItem('exceptionTrace', serialize($exception->getTrace()));
37. $logger->setEventItem('exceptionTraceAsString', $exception->getTraceAsString());
39. $logger->log($message, $priorityLevel);
40. }
42. }
43.  
44. ?>