使用数组过滤器重写

Question

How would I write the following foreach with some conditions using array_filter?

 foreach ($categories as $category) {
        if ($this->request->getParam('category_id')) {
            if ($category->getCategoryId() == $this->request->getParam('category_id')) {
                $selectedCategory = $category;
                break;
            }
        } else {
             No category id in request. Select the first one.
            if (array_key_exists(0, $categoryTree) &&
                $category->getCategoryId() == $categoryTree[0]['id']
            ) {
                $selectedCategory = $category;
                break;
            }
        }
    }

Answer 1

First off, using array_filter isn't helpful in this case as it reduces an array instead of selecting an element. But to show its principles, you could rewrite the code to something like this.

if($this->request->getParam('category_id')){
  $filteredCategories = array_filter($categories, function ($category) use ($this){
    return $category->getCategoryId() == $this->request->getParam('category_id');
  });
  if(count($filteredCategories)>0){
    return $filteredCategories[0];
  }
} else {
  [...]
}