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 		<div class="section"><h2>Renderers<a name="Renderers"></a></h2>
 			<p>Apache log4php can log more than just string messages. If you try to log an object it will be converted
 			to a string and logged. The component which converts Objects to strings in log4php is called a
 			<i>renderer</i>.</p>

 			<div class="section"><h3>Default renderer<a name="Default_renderer"></a></h3>

 				<p>For example, let's say that an application uses a Person object, like this one:</p>

 <div class="prettyprint linenums"><pre>
 class Person {
     public $firstName;
     public $lastName;
     public $age;
 }
 </pre></div>

 				<p>If you try logging it:</p>

 <div class="prettyprint linenums"><pre>
 $person = new Person();
 $person-&gt;firstName = 'John';
 $person-&gt;lastName = 'Doe';
 $person-&gt;age = 37;

 $logger = Logger::getLogger('main');
 $logger-&gt;info(&quot;Here comes the person:&quot;);
 $logger-&gt;info($person);
 </pre></div>
 				<p>Log4php will render it using the default renderer and you will end the output will look something
 				like:</p>

 <div class="prettyprint linenums"><pre>
 INFO - Here comes the person:
 INFO - Person::__set_state(array(
    'firstName' =&gt; 'John',
    'lastName' =&gt; 'Doe',
    'age' =&gt; 37,
 ))
 </pre></div>

 			</div>

 			<div class="section"><h3>Creating a custom renderer<a name="Creating_a_custom_renderer"></a></h3>
 				<p>In order to make log4php render our Person object in a more readable format, we need to create a
 				custom renderer class which will convert Person objects to a string suitable for logging.</p>

 				<p>Let's call our renderer class PersonRenderer.</p>

 <div class="prettyprint linenums"><pre>
 /** All object renderers must implement the LoggerRendererObject interface. */
 class PersonRenderer implements LoggerRendererObject {
     public function render($person) {
         return &quot;{$person-&gt;firstName} {$person-&gt;lastName} ({$person-&gt;age})&quot;;
     }
 }
 </pre></div>

 				<p>Now log4php has to be configured to use PersonRenderer for rendering Person objects. This is done
 				in the configuration file.</p>

 				<p>XML configuration:</p>

 <div class="prettyprint linenums"><pre>
 &lt;configuration xmlns=&quot;http://logging.apache.org/log4php/&quot;&gt;
     &lt;renderer renderedClass=&quot;Person&quot; renderingClass=&quot;PersonRenderer&quot; /&gt;
     &lt;appender name=&quot;defualt&quot; class=&quot;LoggerAppenderEcho&quot; /&gt;
     &lt;root&gt;
         &lt;appender_ref ref=&quot;defualt&quot; /&gt;
     &lt;/root&gt;
 &lt;/configuration&gt;
 </pre></div>

 				<p>Equivalent PHP configuration:</p>

 <div class="prettyprint linenums"><pre>
 array(
     'renderers' =&gt; array(
         'renderedClass' =&gt; 'Person',
         'renderingClass' =&gt; 'PersonRenderer'
     ),
     'appenders' =&gt; array(
         'default' =&gt; array(
             'class' =&gt; 'LoggerAppenderEcho',
         ),
     ),
     'rootLogger' =&gt; array(
         'appenders' =&gt; array('default'),
     ),
 );
 </pre></div>

 				<p>If the same code is run as above, the following output is produced:</p>

 <div class="prettyprint linenums"><pre>
 INFO - Here comes the person:
 INFO - John Doe (37)
 </pre></div>
 				<p>Which is much more readable than the default rendering.</p>
 			</div>

 			<div class="section"><h3>Class hierarchy<a name="Class_hierarchy"></a></h3>
 				<p>Object rendering follows the class hierarchy. </p>

 				<p>For example, if there is a class named Fruit, and classes Orange, Lemon and Apple all extend Fruit.
 				When FruitRenderer is registered as renderer for the Fruit class, all subclasses of Fruit will also
 				be rendered by FruitRenderer. Of course, it is possible to override this by registering OrangeRenderer
 				as renderer for the Orange class.</p>
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	<div class="section"><h2>Renderers<a name="Renderers"></a></h2>
	<p>Apache log4php can log more than just string messages. If you try to log an object it will be converted
	to a string and logged. The component which converts Objects to strings in log4php is called a
	<i>renderer</i>.</p>

	<div class="section"><h3>Default renderer<a name="Default_renderer"></a></h3>

	<p>For example, let's say that an application uses a Person object, like this one:</p>

	<div class="prettyprint linenums"><pre>
	class Person {
	public $firstName;
	public $lastName;
	public $age;
	}
	</pre></div>

	<p>If you try logging it:</p>

	<div class="prettyprint linenums"><pre>
	$person = new Person();
	$person->firstName = 'John';
	$person->lastName = 'Doe';
	$person->age = 37;

	$logger = Logger::getLogger('main');
	$logger->info("Here comes the person:");
	$logger->info($person);
	</pre></div>
	<p>Log4php will render it using the default renderer and you will end the output will look something
	like:</p>

	<div class="prettyprint linenums"><pre>
	INFO - Here comes the person:
	INFO - Person::__set_state(array(
	'firstName' => 'John',
	'lastName' => 'Doe',
	'age' => 37,
	))
	</pre></div>

	</div>

	<div class="section"><h3>Creating a custom renderer<a name="Creating_a_custom_renderer"></a></h3>
	<p>In order to make log4php render our Person object in a more readable format, we need to create a
	custom renderer class which will convert Person objects to a string suitable for logging.</p>

	<p>Let's call our renderer class PersonRenderer.</p>

	<div class="prettyprint linenums"><pre>
	/** All object renderers must implement the LoggerRendererObject interface. */
	class PersonRenderer implements LoggerRendererObject {
	public function render($person) {
	return "{$person->firstName} {$person->lastName} ({$person->age})";
	}
	}
	</pre></div>

	<p>Now log4php has to be configured to use PersonRenderer for rendering Person objects. This is done
	in the configuration file.</p>

	<p>XML configuration:</p>

	<div class="prettyprint linenums"><pre>
	<configuration xmlns="http://logging.apache.org/log4php/">
	<renderer renderedClass="Person" renderingClass="PersonRenderer" />
	<appender name="defualt" class="LoggerAppenderEcho" />
	<root>
	<appender_ref ref="defualt" />
	</root>
	</configuration>
	</pre></div>

	<p>Equivalent PHP configuration:</p>

	<div class="prettyprint linenums"><pre>
	array(
	'renderers' => array(
	'renderedClass' => 'Person',
	'renderingClass' => 'PersonRenderer'
	),
	'appenders' => array(
	'default' => array(
	'class' => 'LoggerAppenderEcho',
	),
	),
	'rootLogger' => array(
	'appenders' => array('default'),
	),
	);
	</pre></div>

	<p>If the same code is run as above, the following output is produced:</p>

	<div class="prettyprint linenums"><pre>
	INFO - Here comes the person:
	INFO - John Doe (37)
	</pre></div>
	<p>Which is much more readable than the default rendering.</p>
	</div>

	<div class="section"><h3>Class hierarchy<a name="Class_hierarchy"></a></h3>
	<p>Object rendering follows the class hierarchy. </p>

	<p>For example, if there is a class named Fruit, and classes Orange, Lemon and Apple all extend Fruit.
	When FruitRenderer is registered as renderer for the Fruit class, all subclasses of Fruit will also
	be rendered by FruitRenderer. Of course, it is possible to override this by registering OrangeRenderer
	as renderer for the Orange class.</p>
	</div>
	</div>


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