Hierarchical Tree Commenting using MySQL PHP

My SQL table structure:

Use Below code for create tree array:

 function getCommentHierachy($threadId, $comments) {
 
    $rtnVal = array();
    foreach ($comments as $comment) {
        if ($threadId == $comment['thread_id']) {
            $rtnVal$comment['id']] = array('comment_data'=>$comment,
            'parent_id' => $comment['parent_id'],
            "id" => $comment['id'],
            'childs'=>array());
        }
    }
      
      $rtnVal = parseTree($rtnVal);
     
      return $rtnVal;
       
    
}
function parseTree($tree, $root = null) {
    $return = array();
    # Traverse the tree and search for direct children of the root
    foreach($tree as $child => $parent) {
        # A direct child is found
        if($parent['parent_id'] == $root) {
            # Remove item from tree (we don't need to traverse this again)
            unset($tree[$child]);
            # Append the child into result array and parse its children
            $return[] = array(
                'id' => $child,
                'comment_data'=>$parent['comment_data'],
                'children' => parseTree($tree, $child)
            );
        }
    }
    return empty($return) ? null : $return;    
}

Use below code to print tree commenting:

function printTree($viewer,$topicId,$threadId,$title,$tree,$count=0) {

    if(!is_null($tree) && count($tree) > 0) {
    if($count==0){
        echo '<ul id="nestedlist" class="nestedlist">';
        }else{
         echo '<ul>';
        }
        foreach($tree as $node) {
       
            echo '<li style="font-size:15px;">'.$node['comment_data']['profile_pic'].'<span style="margin:10px;"><a href="/profile/'.$node['comment_data']['username'].'" ><b style="color:black;font-size:14px;">'.ucfirst($node['comment_data']['displayname']).'</b></a> wrote at '.$node['comment_data']['modified_date'].':</span><br/>';
            echo '<div style="padding-left: 26px;"><p>'.$node['comment_data']['body'].'</p>';
             echo '<span style="margin-left: 10px;font-size:15px;font-weight:bold;"><a href="/forums/topic/'.$topicId.'/nestedreply/post-create?parent_id='.$node['comment_data']['id'].'&thread_id='.$threadId.'">Reply</a>';
             
             echo '</div>';
            printTree($viewer,$topicId,$threadId,$title,$node['children'],1);
           
            echo '</li>';
        }
        echo '</ul>';
    }
}

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