在php中加载大量的json数据

Question

I'm a beginner with this so sorry for the silly question,

I have a json with a large amount of data in it and I have to process this file in php. (Edit/Delete/Filter Objects).

How I am thinking to do it: a class that contains a list of objects and the functions to load objects from json and another to write them back. Also, other functions for operations over the list.

What I'm asking is what is the best way to do this, because my idea is the simplest one, than each time I click on : Edit, Delete, Filter I have to reload again and again the loatJsonObjects(), can you give me a better way to do this, that won't make so many operations each time? Thank you !

Answer 1

So, I shouldn't really attempt to write one for you, but I'm in a really good mood this morning. Try this:

Class Json_Handler {
  private $json_object;
  public function __construct($json_data) {

    if(is_object($json_data) {
      $this->json_object = $json_data;
    }

  }

  public function edit($key, $value) {

    if(isset($this->json_data[$key])) {
     $this->json_data[$key] = $value;
     return $this;
    }
    else {
     return FALSE;
    }

  }

  public function delete($key) {
    if(isset($this->json_data[$key])) {
      unset($this->json_data[$key]);
      return $this;
    }
    else {
      return FALSE;
    }
  }

  public function filter($on = 'key', $filter == NULL) {
     $filtered_objects = array();
     switch($on) {
       case 'key':
       default:
        foreach($this->json_data as $key => $value) {
          if($key == $value) {
            $filtered_objects[] = array($key => $value);
          }
        }
        break;
        case 'value':
         foreach($this->json_data as $key => $value) {
           $filtered_objects[] = array($key => $value);
         }
        break;
     }
     return $filtered_objects;
  }

  public function get_json() {
    return json_encode($this->json_data);
  }

  public function set_json($json) {
    $this->json_data = (is_object($json) ? $json : json_encode($json));
    return $this;
  }

}

You can then use it as so:

$my_json_data = json_decode([...]);
$json = new Json_Handler($my_json_data);
echo $json->edit('test', 'now i have this value')
          ->delete('test')
          ->filter('key', 'bar');
          ->set_json(json_encode($new_json)
          ->get_json();