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What is it?

Nested sets or Nested Set Model is a way to effectively store hierarchical data in a relational table. The main features are:

  • Generation of select elements for forms
  • Generation of lists (ul) consistent with Twitters Bootstrap framework
  • Generation of raw nested (multidimensional) arrays so everyone can extend the script if needed without much trouble

As a bonus you get a Database helper which makes use of PHP’s PDO for communication with the database. You can easily get rid of it and use your own database class.

Example #1: Creating nodes

// $root stores the id of the new node
$root =  Mptt::factory()->create_root('Root node');
             Mptt::factory()->create_child('Child node 1', $root);
             Mptt::factory()->create_child('Child node 2', $root);
$child = Mptt::factory()->create_child('Child node 3', $root);
             Mptt::factory()->create_child('Child node 4', $root);
             Mptt::factory()->create_child('Child node 5', $root);
                 $sibling = Mptt::factory()->create_child('Child of child', $child);
                 Mptt::factory()->create_sibling('Sibling of child', $sibling);

Analyze the code carefully…it will generate an array similar to the one on the screenshot bellow:

Screenshot of array

Example #2: Generating form elements

To make a select element simply pass the id of the desired node to the factory method and then call as_select() on the returned object.

// Calling as_select will generate a valid select element
$node_id = 1;
echo Mptt::factory($node_id)->as_select('node_id');

Screenshot of generated html select box

Example #3: Getting the path of a node

$node_id = 7;
print_r( Mptt::factory()->get_path($node_id) );

Calling get_path will generate an array containing all parent nodes as well as the node itself.

    [1] => Array
            [id] => 1
            [title] => Root node
            [lft] => 1
            [rgt] => 16

    [4] => Array
            [id] => 4
            [title] => Child node 3
            [lft] => 6
            [rgt] => 11

    [7] => Array
            [id] => 7
            [title] => Child of child
            [lft] => 7
            [rgt] => 8

You can then print the path with a simple loop.

Example #4: Deleting

To delete a node and it’s children simply call the delete method and pass the id of the node you want to delete

// don't forget to do some validation after you get the id
$node_id = $_POST['node_id'];

Example #4: Check if node is leaf

A leaf node is a node which has no children nodes. Checking this factor can be useful in situations where you want the user to select the most specific item there is in a given set.

// don't forget to do some validation after you get the id
$node_id = $_POST['node_id'];

if( Mptt::factory()->is_leaf($node_id) )
    // it is leaf ... do whatever you want
    // it has children nodes, show an error message

Example #4: Configuration

There is a number of things you can do to make the returned list more suitable for your needs. Take a look at the config parameters bellow:

echo Mptt::factory(array('only_leaf' => TRUE, 'limit' => 5))->as_select('node_id');

List of configuration parameters, their description, default and expected values

key default type description
only_leaf false boolean (true/false) Select only leaf nodes from the database?
only_leaf_select false boolean (true/false) Make nodes with children unselectable when using as_select()?
limit NULL integer Limit the number of returned nodes (only useful in combination with the only_leaf parameter)
indenter ` `(four spaces) string The bit of text that makes depth of the node visible in select elements
prefix_leaf string Sign that is prepended to the title of leaf items
prefix_non_leaf string Sign that is prepended to the title of non-leaf items

Complete list of functions and their description

as_array($nested = TRUE) Returns raw array
as_html($items = NULL, array $attributes = NULL, $base_url = ’/search?cid=’) Creates a multi-level menu compliant with the Bootstrap css framework
as_select($name, $selected = NULL, array $attributes = NULL) Creates a HTML form select element of the whole tree
create_child($name, $parent_id) Creates new node as child of $parent_id
create_root($name) Creates root node
create_sibling($name, $sibling_id) Creates new node as sibling of $sibling_id
delete_node($node_id) Deletes a node and all it’s children
factory() Sets config and returns Mptt object
get_items() Gets items depending on provided criteria and stores them in a local array
get_node($node_id) Gets all data associated with a node
get_path() Gets an array containing all parent nodes as well as the node itself
is_descendant($node_id, $parent_node_id) Checks whether a node is a descendant of another
is_leaf($node_id) Checks whether the node is leaf or not (A node is leaf when it has no child nodes)


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