CascadiaPHP 2024

The ReflectionProperty class

(PHP 5, PHP 7, PHP 8)


The ReflectionProperty class reports information about class properties.

Class synopsis

class ReflectionProperty implements Reflector {
/* Constants */
public const int IS_STATIC;
public const int IS_READONLY;
public const int IS_PUBLIC;
public const int IS_PROTECTED;
public const int IS_PRIVATE;
/* Properties */
public string $name;
public string $class;
/* Methods */
public __construct(object|string $class, string $property)
private __clone(): void
public static export(mixed $class, string $name, bool $return = ?): string
public getAttributes(?string $name = null, int $flags = 0): array
public getModifiers(): int
public getName(): string
public getValue(?object $object = null): mixed
public hasType(): bool
public isDefault(): bool
public isInitialized(?object $object = null): bool
public isPrivate(): bool
public isPromoted(): bool
public isProtected(): bool
public isPublic(): bool
public isReadOnly(): bool
public isStatic(): bool
public setAccessible(bool $accessible): void
public setValue(object $object, mixed $value): void
public __toString(): string



Name of the property. Read-only, throws ReflectionException in attempt to write.


Name of the class where the property is defined. Read-only, throws ReflectionException in attempt to write.

Predefined Constants

ReflectionProperty Modifiers


Indicates static properties. Prior to PHP 7.4.0, the value was 1.


Indicates readonly properties. Available as of PHP 8.1.0.


Indicates public properties. Prior to PHP 7.4.0, the value was 256.


Indicates protected properties. Prior to PHP 7.4.0, the value was 512.


Indicates private properties. Prior to PHP 7.4.0, the value was 1024.


The values of these constants may change between PHP versions. It is recommended to always use the constants and not rely on the values directly.


Version Description
8.0.0 ReflectionProperty::export() was removed.

Table of Contents

add a note

User Contributed Notes 2 notes

rasmus at mindplay dot dk
13 years ago
I think a more accurate explanation is this:

The Reflection classes are designed to reflect upon the source code of an application, not on any runtime information.

I think you misunderstand the ReflectionProperty constructor in your example above. The fact that it accepts an object as argument is just a convenience feature - you are actually inspecting the class of that object, not the object itself, so it's basically equivalent to:


// works fine
$Reflection = new ReflectionProperty(get_class($a), 'a');

// throws exception
$Reflection = new ReflectionProperty(get_class($a), 'foo');


Getting the class of the object you're passing in is implied, since inspecting a defined property is the purpose of this class.

In your example, $a->foo is a dynamic member - it is not defined as a member of class, so there is no defining class reference, line number, default value, etc. - which means, there is nothing to reflect upon.

Clearly this very useful library could use some real documentation...
Nanhe Kumar
10 years ago
//serialize static properties (class variable)

class Student {

$members = array();
public static

public function
__construct($name = 'Nanhe Kumar') {
$this->name = $name;

public function
__sleep() {
$vars = get_class_vars(get_class($this));
foreach (
$vars as $key => $val) {
if (!empty(
$this->members[$key] = $val;

public function
__wakeup() {
foreach (
$this->members as $key => $val) {
$prop = new ReflectionProperty(get_class($this), $key);
$prop->setValue(get_class($this), $val);
$this->members = array();

public function
getTotalStudent() {


$so1 = new Student();
$so2 = new Student();
$serialized = serialize($so1);
print_r($serialized); //O:7:"Student":2:{s:16:"Studentmembers";a:1:{s:11:"noOfStudent";i:2;}s:7:"*name";s:11:"Nanhe Kumar";}
$unserialized = unserialize($serialized);
print_r($unserialized); //Student Object ( [members:Student:private] => Array ( ) [name:protected] => Nanhe Kumar )
echo Student::$noOfStudent; //2
To Top