Filters
A Filter object blocks a message from being written to the log.
Filtering for All Writers
To filter before all writers, you can add any number of Filters to a
Log object using the addFilter() method:
$logger = new Zend_Log();
$writer = new Zend_Log_Writer_Stream('php://output');
$logger->addWriter($writer);
$filter = new Zend_Log_Filter_Priority(Zend_Log::CRIT);
$logger->addFilter($filter);
// blocked
$logger->info('Informational message');
// logged
$logger->emerg('Emergency message');
When you add one or more Filters to the Log object, the message must pass
through all of the Filters before any Writers receives it.
Filtering for a Writer Instance
To filter only on a specific Writer instance, use the
addFilter() method of that Writer:
$logger = new Zend_Log();
$writer1 = new Zend_Log_Writer_Stream('/path/to/first/logfile');
$logger->addWriter($writer1);
$writer2 = new Zend_Log_Writer_Stream('/path/to/second/logfile');
$logger->addWriter($writer2);
// add a filter only to writer2
$filter = new Zend_Log_Filter_Priority(Zend_Log::CRIT);
$writer2->addFilter($filter);
// logged to writer1, blocked from writer2
$logger->info('Informational message');
// logged by both writers
$logger->emerg('Emergency message');