PHP中的stdClass是什么？如何使用？

stdClass是PHP中的空类, 用于将其他类型转换为对象。它类似于Java或Python对象。 stdClass不是对象的基类。如果将对象转换为对象, 则不会对其进行修改。但是, 如果对对象类型进行了转换/类型转换, 则将创建stdClass的实例(如果它不是NULL)。如果为NULL, 则新实例将为空。

用途：

• stdClass通过调用成员直接访问成员。
• 在动态对象中很有用。
• 用于设置动态属性等。

程序1：使用数组存储数据

<?php
      
//Array definition of an employee
$employee_detail_array = array (
     "name" => "John Doe" , "position" => "Software Engineer" , "address" => "53, nth street, city" , "status" => "best"
);
  
//Display the array content
print_r( $employee_detail_array );
?>

输出如下：

Array
(
    [name] => John Doe
    [position] => Software Engineer
    [address] => 53, nth street, city
    [status] => best
)

程序2：使用stdClass而不是数组来存储员工详细信息(动态属性)

<?php
      
//Object-styled definition of an employee
$employee_object = new stdClass;
$employee_object ->name = "John Doe" ;
$employee_object ->position = "Software Engineer" ;
$employee_object ->address = "53, nth street, city" ;
$employee_object ->status = "Best" ;
      
//Display the employee contents
print_r( $employee_object );
?>

输出如下：

stdClass Object
(
    [name] => John Doe
    [position] => Software Engineer
    [address] => 53, nth street, city
    [status] => Best
)

注意：可以将数组类型转换为对象以及对象到数组。

程序3：将数组转换为对象

<?php
  
//Aarray definition of an employee
$employee_detail_array = array (
     "name" => "John Doe" , "position" => "Software Engineer" , "address" => "53, nth street, city" , "status" => "best"
);
  
//type casting from array to object
$employee = (object) $employee_detail_array ;
      
print_r( $employee );
?>

输出如下：

stdClass Object
(
    [name] => John Doe
    [position] => Software Engineer
    [address] => 53, nth street, city
    [status] => best
)

计划4：将对象属性转换为数组

<?php
      
//Object-styled definition of an employee
$employee_object = new stdClass;
$employee_object ->name = "John Doe" ;
$employee_object ->position = "Software Engineer" ;
$employee_object ->address = "53, nth street, city" ;
$employee_object ->status = "Best" ;
  
//The object is converted into array 
//using type casting
$employee_array = ( array ) $employee_object ;
  
//Display the result in array
print_r( $employee_array );
?>

输出如下：

Array
(
    [name] => John Doe
    [position] => Software Engineer
    [address] => 53, nth street, city
    [status] => Best
)