如何使用PHP将对象推送到对象中的数组

Question

我正在学习如何在php中使用对象和数组。我以前有一个类别数组和一个按类别在php中组织的对象数组：

public function live_scenarios_by_category(){
  $scenario_list = $this->scenarios_model->get_scenario_data();
  if ($scenario_list){
    $categories = array();
    $scenarios_by_category = array();
    $curCatIndex = -1;
    $curCatName = NULL;
    foreach ($scenario_list as $i=>$scenario){
      $category_name = $scenario['t3'];
      if ($curCatName != $category_name){
        $curCatIndex+=1;
        $categories[$curCatIndex] = $category_name;
        $curCatName = $category_name;
      }
      $scenarios_by_category[$curCatIndex][] = $scenario;
    }
    $data['categories'] = $categories;
    $data['scenarios_by_category'] = $scenarios_by_category;
    $this->load->view('data/json_scenarios', $data);
  }
}

然后，我可以成功地输出类别或scenarios_by_category：

echo json_encode($categories);

或

echo json_encode($scenarios_by_category);

但是，我希望“类别”数组成为由表单的每个类别组织的对象(场景)数组：

[{name: "cat1", children: [{name: "scenario1"},{name: "scenario2"}...]}{name:"cat2", children: [...]}];

我试着按以下方式修改代码：

public function live_scenarios_by_category(){
  $scenario_list = $this->scenarios_model->get_scenario_data();
  if ($scenario_list){
    $categories = array();
    $scenarios_by_category = array();
    $curCatIndex = -1;
    $curCatName = NULL;
    foreach ($scenario_list as $i=>$scenario){
      $category_name = $scenario['t3'];
      if ($curCatName != $category_name){
        $curCatIndex+=1;
        //$categories[$curCatIndex] = $category_name;
        $cat_obj = new stdClass;
        $cat_obj->name = $category_name;
        $cat_obj->children = array();
        $categories[$curCatIndex] = $cat_obj;
        $curCatName = $category_name;
      }
      array_push($categories[$curCatIndex]['children'],$scenario);
      //$categories[$curCatIndex]['children'][] = $scenario;
    }
    $data['categories'] = $categories;
    //  $data['scenarios_by_category'] = $scenarios_by_category;
    $this->load->view('data/json_scenarios', $data);
  }
}

但我明白错误

Cannot use object of type stdClass as array

在队伍中：

array_push($categories[$curCatIndex]['children'],$scenario);

我哪里出问题了？

Answer 1

要访问php中的对象，请使用->，使用的是[]，这是一个数组

试着改变这个

array_push($categories[$curCatIndex]['children'],$scenario);

至

array_push($categories[$curCatIndex]->children,$scenario);

Answer 2

如果有关联数组，则可以转换为对象如下：

关联阵列

$associateArray = array(
                'name'          => 'Beef',
                'quantity'      => 1,
                'unit'          => 'ks',
                'unit_price'    => 120
        );

将关联数组转换为Json对象

$JsonObject = json_encode($associateArray);

将Json对象转换为Json PHP (PHP中的对象)

$JsonPhpObject = json_decode($JsonObject);
echo $JsonPhpObject->name;