Get layered navigation filters by category id in magento

In this post we will see how to get layered navigation filters by category id programmatically anywhere you want.

Using this script you will be able to get :

1. Attribute code like Color
2. Attribute options or label like Black, Blue, Red
3. Options value like 20,27,28 (value for above Black, Blue, Red)

So we will make a php file in our root directory for this. Like magento/getLayerdByCat.php

<?php
$mageFilename = 'app/Mage.php';
require_once $mageFilename;

umask(0);
Mage::app();

$categoryID = 4;
$websiteId = Mage::app()->getWebsite()->getId();
$store = Mage::app()->getStore();

try{
    $data = array('status' => true);
    $data['data'] = array();
    $layer = Mage::getModel("catalog/layer");
    $category = Mage::getModel("catalog/category")->load($categoryID);
    $layer->setCurrentCategory($category);
    $attributes = $layer->getFilterableAttributes();
    foreach ($attributes as $attribute) {
        $filterBlockName = 'catalog/layer_filter_attribute';
        $result = Mage::app()->getLayout()->createBlock($filterBlockName)->setLayer($layer)->setAttributeModel($attribute)->init();
        foreach($result->getItems() as $option) {
            $count[] = array('attribute_name' => $option->getLabel(),'attribute_value' => $option->getValue());
        }
        if($count!=null){
            $data['data'][] = array('name'=>ucfirst($attribute->getAttributeCode()),'count'=>$count);
        }
        unset($count);
    }
}
catch (Exception $e) {
    $data = array('status' => false, 'message' => $e->getMessage());
}
echo '<pre>'; print_r($data); die((__FILE__).'--'.(__FUNCTION__));
echo json_encode($data);
 
?>

So you can access values from $data and display if you want to. May be you can return it like return echo json_encode($data) .

I hope it helps.

Be kind to one another. Take care!