php - 具有单个变量的 PHP 类

Question

我正在使用这个 PHP 代码来创建带有默认单变量的 PHP 类。但这并不完美。

Note：我需要将数据存储在单个变量中。

<?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);


?>

我收到了这个错误：

请帮助我，如何解决？

Answer 1

您只声明了变量，但尚未将其设置为“类型”。例如，您试图将值分配给对象的属性......但$data不是对象 - 它不是任何东西。您需要$data在类的构造函数中分配一个对象，或者从类外部分配它。

构造函数：

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();
    }
}

从外面：

// 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

如果你想让你的类灵活，你好类中的 $data 变量必须是一个数组。

例如：

<?php

class Person{

public $data = array();

function __construct(){}

}

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

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

?>