Rendering Taxonomy Tree for custom post types in Wordpress Plugin or Theme as checkbox input

render-taxonomy-tree.php

/**
* Following script will render Taxonomy Tree attached with specified post type
* in following example post_type use: books
* output can be seen here: https://www.diigo.com/item/image/4xv00/xrhq
*/

  $posttype = 'books'
  
      //getting all taxonomies with attached with $posttype
			$taxonomy_names = get_object_taxonomies( $posttype );
			
			//looping taxonomies
   			foreach($taxonomy_names as $taxonomy){
				echo '<label class="heading">'.$taxonomy.'</label>';
				echo '<div class="clearfix"></div>';

				//set these options as you required
				$terms_args = array( 
						'hide_empty'	=> false, 
						'parent'      	=> 0, );
						
				//now pulling terms against each taxonomy
				$terms = get_terms($taxonomy, $terms_args);
				if($terms){

					echo '<ul class="tax-styles">';
					foreach ($terms as $term) {
						
						//defined below, this function will render the terms and li recursively
						render_term_tree($term->term_id, $taxonomy);					
					}
					echo "</ul>";
				}

   			}
   
/**
** this function is rendering terms RECURSIVELY
**/

function render_term_tree($termid, $taxonomy){

	$single_term = get_term($termid, $taxonomy);

	echo '<li>';
	echo '<input type="checkbox" name="post_taxonomy['.$taxonomy.'][]" id="cat_'.$termid.'" value="'.$termid.'">';
	echo '<label for="cat_'.$termid.'">'.$single_term->name.'</label>';

	$childrens = get_term_children($termid, $taxonomy);
	if($childrens){

		//pa_postfront($childrens);
		echo '<ul class="tax-styles">';
		foreach ($childrens as $term_child) {

			//recursive call if children found
			render_term_tree($term_child, $taxonomy);					
		}
	echo "</ul>";	
	}
	

	'</li>';

	
}