Magento 1.9 - get all subcategories of parent category

1) Parent category

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//Parent category $parentCategoryId = 107; $cat = Mage::getModel('catalog/category')->load($parentCategoryId); $subcats = $cat->getChildren();

2) Get 1 Level sub category of Parent category.

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//Get 1 Level sub category of Parent category foreach(explode(',',$subcats) as $subCatid){   $_category = Mage::getModel('catalog/category')->load($subCatid);   if($_category->getIsActive()) {     echo '<ul><a href="'.$_category->getURL().'" title="View the products for the " '.$_category-="">getName().'" category">'.$_category->getName().'</a>';    echo '</ul>';   } }

3) Get 2 Level sub category of Parent sub category.

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// Get 2 Level sub category of Parent sub category   foreach(explode(',',$subcats) as $subCatid) {   $_category = Mage::getModel('catalog/category')->load($subCatid);   if($_category->getIsActive()) {     echo '<ul><a href="'.$_category->getURL().'" title="View the products for the " '.$_category-="">getName().'" category">'.$_category->getName().'</a>';     $sub_cat = Mage::getModel('catalog/category')->load($_category->getId());     $sub_subcats = $sub_cat->getChildren();     foreach(explode(',',$sub_subcats) as $sub_subCatid){           $_sub_category = Mage::getModel('catalog/category')->load($sub_subCatid);           if($_sub_category->getIsActive()) {               echo '<li class="sub_cat"><a href="'.$_sub_category->getURL().'" title="View the products for the " '.$_sub_category-="">getName().'" category">'.$_sub_category->getName().'</a></li>';           }      }      echo '</ul>';   } }

4) Get 3 Level sub sub category of Parent sub sub category

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// Get 3 Level sub sub category of Parent sub sub category   foreach(explode(',',$subcats) as $subCatid) {   $_category = Mage::getModel('catalog/category')->load($subCatid);   if($_category->getIsActive()) {     echo '<ul><a href="'.$_category->getURL().'" title="View the products for the " '.$_category-="">getName().'" category">'.$_category->getName().'</a>';     $sub_cat = Mage::getModel('catalog/category')->load($_category->getId());     $sub_subcats = $sub_cat->getChildren();     foreach(explode(',',$sub_subcats) as $sub_subCatid)     {           $_sub_category = Mage::getModel('catalog/category')->load($sub_subCatid);           if($_sub_category->getIsActive()) {               echo '<li class="sub_cat"><a href="'.$_sub_category->getURL().'" title="View the products for the " '.$_sub_category-="">getName().'" category">'.$_sub_category->getName().'</a></li>';               $sub_sub_cat = Mage::getModel('catalog/category')->load($sub_subCatid);               $sub_sub_subcats = $sub_sub_cat->getChildren();               foreach(explode(',',$sub_sub_subcats) as $sub_sub_subCatid)               {                 $_sub_sub_category = Mage::getModel('catalog/category')->load($sub_sub_subCatid);                 if($_sub_sub_category->getIsActive()) {                     echo '<li class="sub_cat"><a href="'.$_sub_sub_category->getURL().'" title="View the products for the " '.$_sub_sub_category-="">getName().'" category">'.$_sub_sub_category->getName().'</a></li>';                 }               }            }      }      echo '</ul>';   } }

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// $sub_subCatid this is sub category id . means if you want 4 level than it will take 3 level subcategory Id.   $sub_sub_cat = Mage::getModel('catalog/category')->load($sub_subCatid);              $sub_sub_subcats = $sub_sub_cat->getChildren();              foreach(explode(',',$sub_sub_subcats) as $sub_sub_subCatid)              {                $_sub_sub_category = Mage::getModel('catalog/category')->load($sub_sub_subCatid);                if($_sub_sub_category->getIsActive()) {                    echo '<li class="sub_cat"><a href="'.$_sub_sub_category->getURL().'" title="View the products for the " '.$_sub_sub_category-="">getName().'" category">'.$_sub_sub_category->getName().'</a></li>';                }              }