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This is an example of a function we could use to handle that event:
$mainframe->registerEvent('onPrepareFoobar',
'plgFoobarMyPluginPrepareFoobar');
/**
* Makes the name of the foobar uppercase.
*
* @param Foobar Reference to a Foobar object
*/
function plgFoobarMyPluginPrepareFoobar(&$foobar)
{
$foobar->name = strtoupper($foobar->name);
}
The most striking part of this function is the parameter. Earlier in this chapter, we
described how to trigger an event and we passed an array; each element of that array
is passed as a separate parameter to the listeners. In this example we can assume
that the one parameter is the Foobar object, which we passed by reference in the
triggering events example.
A single plugin can contain multiple functions for handling
multiple events.
If we want to create a listener using a class, we extend the abstract class JPlugin.
Before we start building a listener class, we must determine the name for the
class. JPlugin subclasses follow a special naming convention: the word plg, the
name of the plugin group, the name of the plugin element.


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