如何在Codeigniter中訪問stdClass對象數組

Question

我有以下print_r ($rolePermissions); 數組結果，想知道如何動態地僅訪問permID 。

 Array ( [0] => Array ( [0] => stdClass Object ( [roleID] => 1 [permID] => 1 ) [1] => stdClass Object ( [roleID] => 1 [permID] => 2 ) [2] => stdClass Object ( [roleID] => 1 [permID] => 3 ) [3] => stdClass Object ( [roleID] => 1 [permID] => 4 ) [4] => stdClass Object ( [roleID] => 1 [permID] => 5 ) [5] => stdClass Object ( [roleID] => 1 [permID] => 6 ) [6] => stdClass Object ( [roleID] => 1 [permID] => 7 ) [7] => stdClass Object ( [roleID] => 1 [permID] => 8 ) [8] => stdClass Object ( [roleID] => 1 [permID] => 9 ) [9] => stdClass Object ( [roleID] => 1 [permID] => 10 ) [10] => stdClass Object ( [roleID] => 1 [permID] => 11 ) [11] => stdClass Object ( [roleID] => 1 [permID] => 12 ) [12] => stdClass Object ( [roleID] => 1 [permID] => 13 ) [13] => stdClass Object ( [roleID] => 1 [permID] => 14 ) [14] => stdClass Object ( [roleID] => 1 [permID] => 15 ) [15] => stdClass Object ( [roleID] => 1 [permID] => 16 ) [16] => stdClass Object ( [roleID] => 1 [permID] => 17 ) [17] => stdClass Object ( [roleID] => 1 [permID] => 18 ) [18] => stdClass Object ( [roleID] => 1 [permID] => 19 ) [19] => stdClass Object ( [roleID] => 1 [permID] => 20 ) [20] => stdClass Object ( [roleID] => 1 [permID] => 21 ) [21] => stdClass Object ( [roleID] => 1 [permID] => 22 ) [22] => stdClass Object ( [roleID] => 1 [permID] => 23 ) [23] => stdClass Object ( [roleID] => 1 [permID] => 24 ) ) [1] => Array ( [0] => stdClass Object ( [roleID] => 2 [permID] => 2 ) [1] => stdClass Object ( [roleID] => 2 [permID] => 3 ) [2] => stdClass Object ( [roleID] => 2 [permID] => 4 ) ) [2] => Array ( [0] => stdClass Object ( [roleID] => 3 [permID] => 4 ) ) [3] => Array ( ) ) 

我正在訪問以下代碼：

$rolePermission[0]->permID

但是我無法獲取所有記錄，因為結果每次都可以更改，而索引0並非可行的方法。 它顯示一些記錄，並在其他記錄中彈出錯誤。

Error messages:
Undefined offset: 0
Message: Trying to get property of non-object

有什么幫助嗎？

Answer 1

遍歷數組：

$ids = array();
foreach($rolePermission as $permissionObject){
    $ids[] = $permissionObject->permID;
}

或在訪問之前檢查密鑰是否存在：

if(isset($rolePermission[0])) {
    $id = $rolePermission[0]->permID;
}

Answer 2

注意：當您從數據庫中提取值時，使用print_r() ，它將在CI中輸出帶有stdClass Object的數組。

有一種解決方案可以在迭代時不使用stdClass Object顯示數組。

示例：考慮$final考慮數組，並在使用print_r()時顯示stdClass Object 。

• 您必須按如下方式使用循環，以便在打印時避免使用stdClass Object 。

碼：

您可以使用此代碼將其用作使用Controller和Model從數據庫檢索的值。

如果從數據庫檢索到輸出的單行

<?php
foreach($final->result() as $single)
{
   //You can print the variable values over here as follows (E.g) echo $single->id    
}
?>

如果從數據庫檢索到輸出的多行

<?php
$row=array();
foreach($final->result() as $single)
{
   //You can store it as an array here if you are going on with multiple loops
   $row[] = $single; 
}
print_r($row); // here you can save it as an another array
?>

如果您在foreach中使用`-> result（）`來獲取值，則模型代碼應該是什么樣子

如果您使用上述方法檢索輸出，則模型應為以下示例。

employee_model.php

<?php
class Employee_model extends CI_Model{
function __construct() {
parent::__construct();
}

public function getEmployees()
{
    $this->db->select('*');
    $this->db->from('employee');
    $this->db->where('delete_status','0');
    $this->db->where('status','1');
    $this->db->order_by('id','DESC');
    $query = $this->db->get();
    return $query;
}
?>

如何從控制器調用模型

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Home extends Layout_Controller {

public function __construct(){
     parent::__construct();
     $this->load->library("pagination");
     $this->load->model('employee_model');
     $this->load->model('ajax_model');         
 }

 public function employee_listing()
 {
     $result['all_employee'] = $this->employee_model->getEmployees(); // getEmployees is the function name in the employee_model
     $this->load->view('frontend/employee_list',$result);
 }

Answer 3

在模型中編寫此代碼。 最后一行將僅獲取expire列的值，並將傳遞給控制器​​。 然后您可以通過表格視圖訪問它

 function album_expire($user_id ,$album_iid)
{
  $this->db->select('expire');
  $this->db->from('mw_album');
  $this->db->where('user_id', $user_id); 
  $this->db->where('id', $album_iid); 
  return $this->db->get()->row()->expire;
}

在控制器中傳遞值以查看

$data['album_expire'] = $this->albums_model->album_expire($user_id ,$album_iid);

在視圖中這樣訪問

<?php echo $album_expire; ?>