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Understanding Log Events

When you call the log() method or one of its shortcuts, a log event is created. This is simply an associative array with data describing the event that is passed to the writers. The following keys are always created in this array: timestamp, message, priority, and priorityName.

The creation of the event array is completely transparent. However, knowledge of the event array is required for adding an item that does not exist in the default set above.

To add a new item to every future event, call the setEventItem() method giving a key and a value:


The example above sets a new item named pid and populates it with the PID of the current process. Once a new item has been set, it is available automatically to all writers along with all of the other data event data during logging. An item can be overwritten at any time by calling the setEventItem() method again.

Setting a new event item with setEventItem() causes the new item to be sent to all writers of the logger. However, this does not guarantee that the writers actually record the item. This is because the writers won't know what to do with it unless a formatter object is informed of the new item. Please see the section on Formatters to learn more.

Zend Framework