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:
<?php
// 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...
Clase ReflectionProperty
(PHP 5, PHP 7)
Introducción
La clase ReflectionProperty muestra información sobre las propiedades de una clase.
Sinopsis de la Clase
Propiedades
- name
-
Nombre de la propiedad. De sólo lectura, lanza una ReflectionException en un intento de escribir.
- class
-
Nombre de la clase donde se define la propiedad. De sólo lectura, lanza una ReflectionException en un intento de escribir.
Constantes predefinidas
Tabla de contenidos
- ReflectionProperty::__clone — Clonar
- ReflectionProperty::__construct — Construir un objeto ReflectionProperty
- ReflectionProperty::export — Exportar
- ReflectionProperty::getDeclaringClass — Obtiene la clase en la que se declaró
- ReflectionProperty::getDocComment — Obtiene los comentarios de documentación de una propiedad
- ReflectionProperty::getModifiers — Obtiene los modificadores
- ReflectionProperty::getName — Obtiene el nombre de la propiedad
- ReflectionProperty::getValue — Obtiene el valor
- ReflectionProperty::isDefault — Comprueba si una propiedad es predeterminada
- ReflectionProperty::isPrivate — Comprueba si una propiedad es privada
- ReflectionProperty::isProtected — Comprueba si la propiedad es protegida
- ReflectionProperty::isPublic — Comprueba si la propiedad es pública
- ReflectionProperty::isStatic — Comprueba si la propiedad es estática
- ReflectionProperty::setAccessible — Hace accesible una propiedad
- ReflectionProperty::setValue — Establece el valor de la propiedad
- ReflectionProperty::__toString — Convertir a texto
add a note
User Contributed Notes 3 notes
rasmus at mindplay dot dk ¶
7 years ago
james at digitaledgeit dot com dot au ¶
7 years ago
Please ignore my previous note. I didn't fully understand what the previous notes were referring to as "runtime". I now see they were referring to a slightly different question.
Apologies!
Nanhe Kumar ¶
4 years ago
<?php
//serialize static properties (class variable)
class Student {
private $members = array();
protected $name;
public static $noOfStudent;
public function __construct($name = 'Nanhe Kumar') {
$this->name = $name;
Student::$noOfStudent++;
}
public function __sleep() {
$vars = get_class_vars(get_class($this));
foreach ($vars as $key => $val) {
if (!empty($val))
$this->members[$key] = $val;
}
return array_keys(get_object_vars($this));
}
public function __wakeup() {
foreach ($this->members as $key => $val) {
$prop = new ReflectionProperty(get_class($this), $key);
$prop->setValue(get_class($this), $val);
}
$this->members = array();
}
public function getTotalStudent() {
return self::$noOfStudent;
}
}
$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
?>
