Description:

Zend_Log is a component for general purpose logging. It supports
multiple log backends, formatting messages sent to the log, and
filtering messages from being logged. These functions are divided into
the following objects:
- A Log (instance of Zend_Log) is the object that your application
uses the most. You can have as many Log objects as you like; they do
not interact. A Log object must contain at least one Writer, and can
optionally contain one or more Filters.
- A Writer (inherits from Zend_Log_Writer_Abstract) is responsible for
saving data to storage.
- A Filter (implements Zend_Log_Filter_Interface) blocks log data from
being saved. A filter may be applied to an individual Writer, or to a
Log where it is applied before all Writers. In either case, filters
may be chained.
- A Formatter (implements Zend_Log_Formatter_Interface) can format the
log data before it is written by a Writer. Each Writer has exactly one
Formatter.