具有單個變量的PHP類

Question

我正在使用此PHP代碼創建具有默認單個變量的PHP類。 但它並不完美。

Note：我需要將數據存儲在單個變量中。

<?PHP 

class hello 
{ 
    public $data; 
} 

$test = new hello(); 

$test->data->user1->name = "Charan"; 
$test->data->user1->sex = "male"; 
$test->data->user1->age = "25"; 

$test->data->user2->name = "Kajal"; 
$test->data->user2->sex = "female"; 
$test->data->user2->age = "21"; 


print_r($test->data->user1); 


?> 

我得到這個錯誤：

請幫助我，如何解決它？

Answer 1

你只聲明瞭變量，但你還沒有設置它爲「類型」。例如，你試圖給對象的屬性賦值......但是$data不是一個對象 - 它不是任何東西。您需要在類的構造函數中爲對象分配$data，或者從類外部分配對象。

構造：

class hello 
{ 
    public $data; 

    public function __construct() { 
     $this->data = new StdClass(); 

     // assuming you want the users set up here as well 
     $this->data->user1 = new StdClass(); 
     $this->data->user2 = new StdClass(); 
    } 
} 

來自外部：

// assume we are use the same class definition from your orginal example 
$test = new hello(); 
$test->data = new StdClass(); 
$test->data->user1 = new StdClass(); 
$test->data->user2 = new StdClass(); 

$test->data->user1->name = "Charan"; 
$test->data->user1->sex = "male"; 
$test->data->user1->age = "25"; 

$test->data->user2->name = "Kajal"; 
$test->data->user2->sex = "female"; 
$test->data->user2->age = "21"; 

Answer 2

如果你想你的類靈活，你好類中$數據變量必須是一個數組。

例如：

<?php 

class Person{ 

public $data = array(); 

function __construct(){} 

} 

$person = new Person(); 
$person->data['name'] = 'Juan Dela Cruz'; 

echo $person->data['name']; 

?>