joomla How to set page title, meta description & meta keywords

joomla How to set page title, meta description & meta keywords

Create an object 

$document =& JFactory::getDocument(); 

Set the page title 

$page_title ='This is Page Title';
$document->setTitle($page_title ); 

Set the page description 

$page_description ='This is page descriptions'; 
$document->setDescription( $page_description); 

Set the page keywords 

$page_keywords ='This is keywords';
$document->setMetadata( 'keywords', $page_keywords);