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The stdClass class

(PHP 4, PHP 5, PHP 7, PHP 8)

Introduction

A generic empty class with dynamic properties.

Objects of this class can be instantiated with new operator or created by typecasting to object. Several PHP functions also create instances of this class, e.g. json_decode(), mysqli_fetch_object() or PDOStatement::fetchObject().

Despite not implementing __get()/__set() magic methods, this class allows dynamic properties and does not require the #[\AllowDynamicProperties] attribute.

This is not a base class as PHP does not have a concept of a universal base class. However, it is possible to create a custom class that extends from stdClass and as a result inherits the functionality of dynamic properties.

Class synopsis

class stdClass {
}

This class has no methods or default properties.

Examples

Example #1 Created as a result of typecasting to object

<?php
$obj
= (object) array('foo' => 'bar');
var_dump($obj);

The above example will output:

object(stdClass)#1 (1) {
  ["foo"]=>
  string(3) "bar"
}

Example #2 Created as a result of json_decode()

<?php
$json
= '{"foo":"bar"}';
var_dump(json_decode($json));

The above example will output:

object(stdClass)#1 (1) {
  ["foo"]=>
  string(3) "bar"
}

Example #3 Declaring dynamic properties

<?php
$obj
= new stdClass();
$obj->foo = 42;
$obj->{1} = 42;
var_dump($obj);

The above example will output:

object(stdClass)#1 (2) {
  ["foo"]=>
  int(42)
  ["1"]=>
  int(42)
}
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User Contributed Notes 1 note

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Mats M
23 days ago
In PHP8 this has been changed

https://www.php.net/manual/en/migration80.incompatible.php

A number of warnings have been converted into Error exceptions:

Attempting to write to a property of a non-object. Previously this implicitly created an stdClass object for null, false and empty strings.

So if you add properties to a $var, you first need to make it a stdClass()

$var = new stdClass();
$var->propp1 = "nice";
$var->propp2 = 1234;
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