Logging container -- Log supports different types of data containers.
'composite' - Log_composite
Creates a virtual log container consisting of multiple children containers. This makes it possible to send the same events to a collection of other Log instances.
'console' - Log_console
Writes log messages to the text console.
'display' - Log_display
Writes log messages to the browser display (using echo()).
'error_log' - Log_error_log
Logs messages using PHP's error_log() function.
'file' - Log_file
Stores data in an arbitrary file on a local file system (local refers to any file accessible using PHP's filesystem functions).
'mail' - Log_mail
Sends log messages to a mailbox. The mail is actually sent when you close() the logger, or when the destructor is called (when the script is terminated).
'mcal' - Log_mcal
Stores data in a calendar application. This requires the libmcal and mcal PHP extensions.
'null' - Log_null
Simply consumes log events. This container can be used for notifications when there is no need to log the message.
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