Filters

A Filter object blocks a message from being written to the log.

You can add a filter to a specific Writer using addFilter() method of that Writer:

use Zend\Log\Logger;

$logger = new Logger();

$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(Logger::CRIT);
$writer2->addFilter($filter);

// logged to writer1, blocked from writer2
$logger->info('Informational message');

// logged by both writers
$logger->emerg('Emergency message');

Available filters

The Zend\Log\Filter available are:

• Priority, filter logging by $priority. By default, it will accept any log event whose priority value is less than or equal to $priority.
• Regex, filter out any log messages not matching the regex pattern. This filter use the preg_match() function of PHP.
• SuppressFilter, this is a simple boolean filter. Call suppress(true) to suppress all log events. Call suppress(false) to accept all log events.
• Validator, filter out any log messages not matching the Zend\Validator\Validator object passed to the filter.