To log a message, call the log() method of a Log instance
and pass it the message with a corresponding priority:
<?php
$logger->log('Informational message', Zend_Log::INFO);
The first parameter of the log() method is a string
message and the second parameter is an integer
priority. The priority must be one of the priorities recognized by
the Log instance. This is explained in the next section.
A shortcut is also available. Instead of calling the log()
method, you can call a method by the same name as the priority:
<?php
$logger->log('Informational message', Zend_Log::INFO);
$logger->info('Informational message');
$logger->log('Emergency message', Zend_Log::EMERG);
$logger->emerg('Emergency message');