In CakePHP, sometimes the need arises to generate a full URL, sending links within an email for example. To generate a full URL use the following code

<?php
echo $this->Html->url(array('controller' => 'something', 'action' => 'something'), true);
?>

To create a clickable link to the full URL, you can use the above code in conjunction with Html->link like so

<?php
echo $this->Html->link('Your text here', $this->Html->url(
    array(
        'controller' => 'something', 
        'action' => 'something'
    ), true
));
?>