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This pastie shows how the output of Zend_View_Helper_Navigation_Menu
can be controlled with the options minDepth, maxDepth, onlyActiveBranch,
and renderParents.

Available options (in addition to indent and ulClass):
minDepth (default: null)
maxDepth (default: null)
onlyActiveBranch (default: false)
renderParents (default: true)

Notes:
* Each use case shows a stripped-down text-only version of output from:
  $helper->renderMenu($container, $options)
* UC-1 shows the entire $container, and could be used as a reference point
  for the later use cases.
* Page 1 is on level 0 (along with Page 2 and Page 3). Page 2.1 is on
  level 2, Page 2.1.1 on level 3, etc.
* All use cases are implemented in an example PHP file at the bottom of 
  the paste. The only requirement is that the current ZF incubator is on
  your include_path.

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Page 1
Page 2
  Page 2.1
    Page 2.1.1
    Page 2.1.2
      Page 2.1.2.1
      Page 2.1.2.2
      Page 2.1.2.3
    Page 2.1.3
  Page 2.2
    Page 2.2.1
    Page 2.2.2
    Page 2.2.3
  Page 2.3
Page 3

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Page 1
Page 2
  Page 2.1
  Page 2.2
  Page 2.3
Page 3

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Page 2.1
  Page 2.1.1
  Page 2.1.2
    Page 2.1.2.1
    Page 2.1.2.2
    Page 2.1.2.3
  Page 2.1.3
Page 2.2
  Page 2.2.1
  Page 2.2.2
  Page 2.2.3
Page 2.3

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9

Page 2.1
  Page 2.1.1
  Page 2.1.2
  Page 2.1.3
Page 2.2
  Page 2.2.1
  Page 2.2.2
  Page 2.2.3
Page 2.3

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// deepest active page is Page 2.1.2 (level 2)
Page 2
  Page 2.1
    Page 2.1.2
      Page 2.1.2.1
      Page 2.1.2.2
      Page 2.1.2.3

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4

// deepest active page is Page 2.1.2 (level 2)
Page 2.1.2.1
Page 2.1.2.2
Page 2.1.2.3

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6

// deepest active page is Page 2.1.2 (level 2)
Page 2.1
  Page 2.1.2
    Page 2.1.2.1
    Page 2.1.2.2
    Page 2.1.2.3

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// deepest active page is Page 2.1.2 (level 2)
Page 2
  Page 2.1
    Page 2.1.1
    Page 2.1.2
    Page 2.1.3

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// deepest active page is Page 2.1.2 (level 2)
Page 2.1
  Page 2.1.1
  Page 2.1.2
  Page 2.1.3

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4

// deepest active page is Page 2.1.2.2 (level 3)
Page 2.1.1
Page 2.1.2
Page 2.1.3

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<?php
// a simple file to run the 10 menu use cases
// usage: php menu-uc.php

// setup
require_once 'Zend/Loader.php';
Zend_Loader::registerAutoload();
$view = new Zend_View();

// create container
$container = new Zend_Navigation(array(
    array(
        'label' => 'Page 1',
        'uri'   => '#'
    ),
    array(
        'label' => 'Page 2',
        'uri'   => '#',
        'pages' => array(
            array(
                'label' => 'Page 2.1',
                'uri'   => '#',
                'pages' => array(
                    array(
                        'label' => 'Page 2.1.1',
                        'uri'   => '#'
                    ),
                    array(
                        'label' => 'Page 2.1.2',
                        'uri'   => '#',
                        'pages' => array(
                            array(
                                'label' => 'Page 2.1.2.1',
                                'uri'   => '#'
                            ),
                            array(
                                'label' => 'Page 2.1.2.2',
                                'uri'   => '#'
                            ),
                            array(
                                'label' => 'Page 2.1.2.3',
                                'uri'   => '#'
                            )
                        )
                    ),
                    array(
                        'label' => 'Page 2.1.3',
                        'uri'   => '#'
                    )
                )
            ),
            array(
                'label' => 'Page 2.2',
                'uri'   => '#',
                'pages' => array(
                    array(
                        'label' => 'Page 2.2.1',
                        'uri'   => '#'
                    ),
                    array(
                        'label' => 'Page 2.2.2',
                        'uri'   => '#'
                    ),
                    array(
                        'label' => 'Page 2.2.3',
                        'uri'   => '#'
                    )
                )
            ),
            array(
                'label' => 'Page 2.3',
                'uri'   => '#'
            )
        )
    ),
    array(
        'label' => 'Page 3',
        'uri'   => '#'
    )
));

$useCases = array(
    1 => array(),
    2 => array('maxDepth' => 1),
    3 => array('minDepth' => 1),
    4 => array('minDepth' => 1, 'maxDepth' => 2),
    5 => array('onlyActiveBranch' => true),
    6 => array('onlyActiveBranch' => true, 'renderParents' => false),
    7 => array('minDepth' => 1, 'onlyActiveBranch' => true),
    8 => array('maxDepth' => 2, 'onlyActiveBranch' => true),
    9 => array('minDepth' => 1, 'maxDepth' => 2, 'onlyActiveBranch' => true),
    10 => array('minDepth' => 2, 'maxDepth' => 2, 'onlyActiveBranch' => true)
);

foreach ($useCases as $uc => $options) {
    if ($uc == 10) {
        $active = $container->findByLabel('Page 2.1.2.2');
        $active->active = true;
    } elseif ($uc > 4) {
        $active = $container->findByLabel('Page 2.1.2');
        $active->active = true;
    }

    echo 'UC-', $uc, ':', PHP_EOL;
    echo $view->navigation()->menu()->renderMenu($container, $options);
    echo PHP_EOL, PHP_EOL;

    if ($uc > 4) {
        $active->active = false;
    }
}