PHP - Manual: ReflectionProperty

2024-11-13

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ReflectionProperty 类

(PHP 5, PHP 7, PHP 8)

简介

ReflectionProperty 类报告了类的属性的相关信息。

类摘要

class ReflectionProperty implements Reflector {

/* 常量 */

const integer IS_STATIC = 1;

const integer IS_PUBLIC = 256;

const integer IS_PROTECTED = 512;

const integer IS_PRIVATE = 1024;

/* 属性 */

public $name;

public $class;

/* 方法 */

private __clone(): void

public static export(mixed $class, string $name, bool $return = ?): string

public getAttributes(?string $name = null, int $flags = 0): array

public getDeclaringClass(): ReflectionClass

public getDefaultValue(): mixed

public getDocComment(): string|false

public getModifiers(): int

public getName(): string

public getType(): ?ReflectionType

public getValue(?object $object = null): mixed

public hasDefaultValue(): bool

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

}

属性

name: 属性的名称。只读，在尝试赋值的时候抛出 ReflectionException。
class: 定义的属性所在的类。只读，在尝试赋值的时候抛出 ReflectionException。

预定义常量

ReflectionProperty 修饰符

ReflectionProperty::IS_STATIC: 指示了 static 的属性。
ReflectionProperty::IS_PUBLIC: 指示了 public 的属性。
ReflectionProperty::IS_PROTECTED: 指示了 protected 的属性。
ReflectionProperty::IS_PRIVATE: 指示了 private 的属性。

ReflectionProperty::__clone — Clone
ReflectionProperty::__construct — Construct a ReflectionProperty object
ReflectionProperty::export — Export
ReflectionProperty::getAttributes — Gets Attributes
ReflectionProperty::getDeclaringClass — Gets declaring class
ReflectionProperty::getDefaultValue — Returns the default value declared for a property
ReflectionProperty::getDocComment — Gets the property doc comment
ReflectionProperty::getModifiers — Gets the property modifiers
ReflectionProperty::getName — Gets property name
ReflectionProperty::getType — Gets a property's type
ReflectionProperty::getValue — Gets value
ReflectionProperty::hasDefaultValue — Checks if property has a default value declared
ReflectionProperty::hasType — Checks if property has a type
ReflectionProperty::isDefault — Checks if property is a default property
ReflectionProperty::isInitialized — Checks whether a property is initialized
ReflectionProperty::isPrivate — Checks if property is private
ReflectionProperty::isPromoted — Checks if property is promoted
ReflectionProperty::isProtected — Checks if property is protected
ReflectionProperty::isPublic — Checks if property is public
ReflectionProperty::isReadOnly — 检查属性是否为只读
ReflectionProperty::isStatic — Checks if property is static
ReflectionProperty::setAccessible — Set property accessibility
ReflectionProperty::setValue — Set property value
ReflectionProperty::__toString — To string

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User Contributed Notes 2 notes

down

rasmus at mindplay dot dk ¶

11 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:

<?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...

down

-10

Nanhe Kumar ¶

8 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
?>

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官方地址：https://www.php.net/manual/en/class.reflectionproperty.php

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ReflectionProperty 类

简介

类摘要

属性

预定义常量

ReflectionProperty 修饰符

目录

User Contributed Notes 2 notes