Remove Icon Arrow if Category haven't Sub-category in Laravel

Question

enter code here Does any one can advice me how to remove the icon for main category havent's sub-categories. I have pass to show sub-categories under main category.

Here is my code: [enter image description here][1]

My view:

[blade View][2] [1]: https://i.stack.imgur.com/MbDuB.png [2]: https://i.stack.imgur.com/ieAqL.png

My Update with code

    public static function showCategories($categories, $parent_id = 0)
{
  $class  ='';
  $html = ""; //init
  $flag = false;
           foreach ($categories as $row) {
              if ($row['parent_id'] == $parent_id) {
                 //we have a category
                 $link =self::linkCategory($row['category_id'],$row['name']);
                 $html .= '<ul id="accordion" class="accordion">
                                          <li>
                                          <div class="link accordion-title"><a href="'.$link.'">'.$row['name'].'</a><i class="fa fa-chevron-down"></i></div>';
                                          $html .= "<ul class='submenu'>";
                 foreach ($categories as $subcat) {

                       $link =self::linkCategory($subcat['category_id'],$subcat['name']);
                       if ($subcat['parent_id'] ==$row['category_id']){
                          //we have a subcategory
                          $html .= '<li><a href="'.$link.'">'.$subcat['name'].'</a></li>';
                       }
                 }
                       $html .= "</ul>";
                     $html .= "</li>";
                 $html .= "</ul>";
              }
     }      
     return $html;

//call it blade $menu = URL::showCategories($itemCategory);

Answer 1

first of all its a bad practice that you use HTML in control, you have to use HTML only in blade sec you can do that by making the relation between categories and itself to get the sub cat to every cat then if your blade while you are looping it u can easily use Count() to get number of sub cat if it bigger than 0
add icon if don't add it

@if(Count($cat->sub) > 0) 
    <i class="icon-class">
 @endif