Алексей

$lave = array("a", "b","c", "d", "e", "f");
  
  for($i = 0; $i < count($lave) + 1; $i++) {
    if($i < count($lave)) {
    echo $lave[$i] . "<br />";
    }
    else {
      echo $i;
    }
  }

foreach ($children as $key => $child) {
    $children[$key]['href'] = $this->url->link('product/category', 'path='.
    $this->request->get['path'].'_'.$child['category_id'].$url);
}

foreach ($children as &$child) {
    $child['href'] = $this->url->link('product/category', 'path='.
    $this->request->get['path'].'_'.$child['category_id'].$url);
}