Copy this plugin in a directory called "Taxonomy" inside of your plugin directory You can now load the plugin in your bootstrap.php using
CakePlugin::load('Taxonomy',array('bootstrap'=>true));
After you have to create the two tables (terms and term_relationships) You can create theses tables easily using the CakePHP Console :
cake Taxonomy.create
Now the plugin is ready to use you have a "Term" model that you can use to store your taxonomy. If you want to add a Taxonomy to your model just add the "Taxonomy.Taxonomy" behavior.
You can now add a "term" to your model using
$this->Model->addTerm('TermName','type')
For instance
$this->Model->id = 3;
$this->Model->addTerm('dog','pet');
$this->Model->addTerm('cat','pet');
Moreover the behavior add a "terms" virtual field within your find results (if you properly set the recursive) and a "Taxonomy" index containing all your terms indexed by their type. If you want to create checkboxes for editing a specifing Taxonomy
$this->Form->input('Model.terms.type',array('type'=>'select','multiple'=>'checkbox','options'=>$options));
For instance if you want to edit the pet of an User
$this->Form->input('Model.terms.pet',array('type'=>'select','multiple'=>'checkbox','options'=>$pets)))
If you want to find the list of some terms
$this->Model->listTerms('pet','category','tag',....);
The Taxonomy helper allow you to create a quick and easy Taxonomy system Firstly you have to load the Helper
public $helper = array('Html','Form','Taxonomy.Taxonomy');
To create a quick and easy tag manager use
$this->Taxonomy->input('pet',array('label'=>'My pet'));
The first parameter is the taxonomy type The second parameter is an array of option (the same than FormHelper::Input);