WordPress: Template Helpers using Anonymous Functions

alternatives.php

<?php
// Alternative 1
function my_postbox_fun() {
	# code...
}
postbox( 'My Awesome Postbox', 'my_postbox_fun' );

// Alternative 2
class my_example_class
{	
	function __construct() {
		postbox( 'My Awesome Postbox', array( $this, 'my_postbox_fun' ) );
	}
	
	function my_postbox_fun() {
		# code...
	}
}

postbox.html

<div class="postbox">
	<h3><span><!-- postbox name --></span></h3>
	<div class="inside">
		<!-- postbox content -->
	</div> <!-- .inside -->
</div>

postbox.php

<?php
/**
 * Postbox helper function.
 * 
 * @param string $name
 * @param function $content
 */
function postbox( $name, $content ) {
	?>
	<div class="postbox">
		<h3><span><?php echo $name; ?></span></h3>
		<div class="inside">
			<?php call_user_func( $content ); ?>
		</div> <!-- .inside -->
	</div>
	<?php
}

postbox( 'My Awesome Postbox', function () {
	$my_option = get_option( 'my_option' );
	?>
	<form action="" method="post">
		<!-- ... -->
	</form>
	<?php
});

call_user_func( $content );

Really? :)

Uhm, yes?
http://de2.php.net/manual/en/function.call-user-func.php Example #5