Count all posts under multiple child terms in a custom taxonomy

Question

I have a custom hierarchical taxonomy, an example is below:

Filmmaking(?)
--->Production(1)
--->Post-Production (?)
------->VFX (3)
------->Editing(2)
--->Distribution(0)

I want the count next to Filmmaking be the count of all posts under all its child terms, however nested they be. So in this example it should read 6;

• Production 1 post
• VFX 3 Posts
• Editing 2 posts.

Likewise, Post-production would read 5

In my current code the count is instead counting how many child terms have posts (so 3 for filmmaking), not how many posts they have .

$getParents = [
    'taxonomy'     => $taxonomy,
    'parent'        => 0,
    'number'        => 0,
    'hide_empty'    => false  
];

$parent_terms = get_terms( $getParents );  

    foreach ( $parent_terms as $parent_term ) {   

    if ( hasChildren($parent_term) ) {

        printIndexHasChildren( $parent_term);
        echo '<ul>';

        echo '<li><a id="'.$parent_term->slug.'" href="'. get_term_link( $parent_term ) .'"> All '. $parent_term->name.'</a></li>';

        //Loop through child items and output name
        foreach ( get_terms( 'kernal_category', array( 'hide_empty' => false, 'parent' => $parent_term->term_id ) ) as $child_term) {                   

            if ( hasChildren( $child_term ) ) {

              printIndexHasChildren( $child_term);
              echo '<ul>';

            //If child has second child
            foreach ( get_terms( 'kernal_category', array( 'hide_empty' => false, 'parent' => $child_term->term_id ) ) as $second_child_term) {

              printIndexNoChildren( $second_child_term );

            }

            echo '</ul>';
            echo '</li>';       

          } else {

            printIndexNoChildren( $child_term );              

          }
        }

        echo '</ul>';
        echo '</li>';

      } else {
        printIndexNoChildren( $parent_term);             
      }     

      }

  }  else {

   ... do something 
  }   
}

The two functions that actually write out the menu are:

//Printing Independent List Elements
function printIndexNoChildren($term) {
  echo '<li><a id="'.$term->slug.'" href="'. get_term_link( $term ) .'">'. $term->name.' ('.$term->count.')</a></li>';
}


//Print List Elements With Children
function printIndexHasChildren($term) {
  echo '<li><a id="'.$term->slug.'" href="'. get_term_link( $term ) .'">'. $term->name.' ('.$term->count.')</a>';
}

Answer 1

Edit: Unhappy with original answer provided I completely redid it in the form of a new function called countDescendentTerms.

I called this from the two previous functions printIndexNoChildren and printIndexHasChildren.

function countDescendentTerms($term) {

   if (!$term) 
      return false;

   //Define Arguments to Send to get_terms
      $getTerms = [
        'taxonomy'     => 'kernal_category',
        'parent'        => $term->term_id,
        'hide_empty'    => false  
      ];

   $descendentTerms = get_terms( 'kernal_category', $getTerms  );

   if( !is_wp_error($descendentTerms)) {

      $parentCountX = $term->count;   

      foreach ( $descendentTerms as $firstChildTermX ) {

         if (  hasChildren($firstChildTermX)  ) {           

            foreach ( get_terms(  'kernal_category', array( 'hide_empty' => false, 'parent' => $firstChildTermX->term_id  )  ) as $secondChildTermX  ) {

               if (  hasChildren(   $secondChildTermX    )  ) {

                  foreach ( get_terms(  'kernal_category', array( 'hide_empty' => false, 'parent' => $secondChildTermX->term_id  )  ) as $thirdChildTermX  ) {

                     $thirdChildCountX += $thirdChildTermX->count;                

                  }
               }

               $secondChildCountX += $secondChildTermX->count;

            }

         $totalThirdChildCountX += $thirdChildCountX;
         $thirdChildCountX = 0;

         }

         $firstChildCountX += $firstChildTermX->count;

      }

      $totalPostCountx  = $parentCountX + $firstChildCountX + $secondChildCountX + $totalThirdChildCountX;
      $secondChildCountX = 0;
      return $totalPostCountx;



   } else {
      print_r('Error');
   }  

}

I called this from the two previous functions printIndexNoChildren and printIndexHasChildren.

//Printing Independent List Elements
function printIndexNoChildren($term) {

   $postCountX = countDescendentTerms( $term );   

   echo '<li><a id="'.$term->slug.'" href="'. get_term_link( $term ) .'">'. $term->name.' ('.$postCountX.')</a></li>';
}

//Print List Elements With Children
function printIndexHasChildren($term, $array = null) { 


   $postCountX = countDescendentTerms( $term );  

   echo '<li><a id="'.$term->slug.'" href="'. get_term_link( $term ) .'">'. $term->name.' ('.$postCountX.')</a>';   
}