Joomla! Documentation™

According to

<?php print_r($this); ?>

in Joomla! 3.1, the object $this within the index.php file of the Protostar template looks like:

JDocumentHTML Object 
(
	 [_links] => Array 
		(
			 [http://j3demo/?view=featured] => Array
				 (
					[relation] => canonical
					[relType] => rel 
					[attribs] => Array 
						(
						 )
				 )
			 [/index.php?format=feed&type=rss] => Array 
				(
					[relation] => alternate 
					[relType] => rel 
					[attribs] => Array 
						( 
							[type] => application/rss+xml 
							[title] => RSS 2.0 )
						 )
					 [/index.php?format=feed&type=atom] => Array 
						( 
							[relation] => alternate 
							[relType] => rel [attribs] => Array 
								( 
									[type] => application/atom+xml 
									[title] => Atom 1.0
								 ) 
						 ) 
	[_custom] => Array 
		(
		 ) 
	[template] => protostar 
	[baseurl] => 
	[params] => JRegistry Object 
		( 
			[data:protected] => stdClass Object 
				( 
					[templateColor] => 
					[logoFile] => 
					[googleFont] => 1 
					[googleFontName] => Open+Sans 
					[fluidContainer] => 0 
                                ) 
		) 
	[_file] => /home/j3demo/public_html/templates/protostar/index.php 
	[_template:protected] => 
	[_template_tags:protected] => Array 
		( 
		) 
	[_caching:protected] => 
	[_html5:JDocumentHTML:private] => 
	[title] => Home 
	[description] => Joomla 3 demo 
	[link] => [base] => http://j3demo/ 
	[language] => en-gb 
	[direction] => ltr 
	[_generator] => Joomla! - Open Source Content Management 
	[_mdate] => 
	[_tab] => 
	[_lineEnd] => 
	[_charset] => utf-8 
	[_mime] => text/html 
	[_namespace] => 
	[_profile] => 
	[_scripts] => Array 
		( 
			[/media/system/js/mootools-core.js] => Array 
				( 
					[mime] => text/javascript 
					[defer] => [async] => 
				) 
			[/media/system/js/core.js] => Array 
				( 
					[mime] => text/javascript 
					[defer] => 
					[async] => 
				) 	
			[/media/system/js/caption.js] => Array 
				( 
					[mime] => text/javascript 
					[defer] => 
					[async] => 
				) 
			[/media/jui/js/jquery.min.js] => Array 
				( 
					[mime] => text/javascript 
					[defer] => 
					[async] => 
				) 
			[/media/jui/js/jquery-noconflict.js] => Array 
				( 
					[mime] => text/javascript 
					[defer] => 
					[async] => 
				) 
			[/media/jui/js/bootstrap.min.js] => Array 
				( 
					[mime] => text/javascript 
					[defer] => 
					[async] => 
				) 
		) 
	[_script] => Array 
		( 
			[text/javascript] => window.addEvent('load', function() { 
				new JCaption('img.caption'); 
			}); ) 
	[_styleSheets] => Array 
		( 
			[templates/protostar/css/template.css] => Array 
				( 
					[mime] => text/css 
					[media] => 
					[attribs] => Array 
						( 
						) 
				) 
		) 
	[_style] => Array 
		( 
		) 
	[_metaTags] => Array 
		( 
			[http-equiv] => Array 
				( 
					[content-type] => text/html; charset=utf-8 
				) 
			[standard] => Array 
				( 
					[keywords] => 
					[rights] => 
				) 
		) 
	[_engine] => 
	[_type] => html 
	[_errors:protected] => Array
        		(
        		)
)

Example of using objects

<link rel="stylesheet" href="'''<?=$this->baseurl ?>'''/templates/'''<?=$this->template ?>'''/css/template_css.css" type="text/css"/>