ReflectionProperty::__construct

(PHP 5, PHP 7, PHP 8)

ReflectionProperty::__construct — Construct a ReflectionProperty object

说明

public ReflectionProperty::__construct ( object|string $class , string $property )

Warning

本函数还未编写文档，仅有参数列表。

参数

class: Either a string containing the name of the class to reflect, or an object.
property: The name of the property being reflected.

返回值

没有返回值。

错误／异常

Trying to get or set private or protected class property's values will result in an exception being thrown.

范例

Example #1 ReflectionProperty::__construct() example


<?php
class Str
{
    public $length  = 5;
}

// Create an instance of the ReflectionProperty class
$prop = new ReflectionProperty('Str', 'length');

// Print out basic information
printf(
    "===> The%s%s%s%s property '%s' (which was %s)\n" .
    "     having the modifiers %s\n",
        $prop->isPublic() ? ' public' : '',
        $prop->isPrivate() ? ' private' : '',
        $prop->isProtected() ? ' protected' : '',
        $prop->isStatic() ? ' static' : '',
        $prop->getName(),
        $prop->isDefault() ? 'declared at compile-time' : 'created at run-time',
        var_export(Reflection::getModifierNames($prop->getModifiers()), 1)
);

// Create an instance of Str
$obj= new Str();

// Get current value
printf("---> Value is: ");
var_dump($prop->getValue($obj));

// Change value
$prop->setValue($obj, 10);
printf("---> Setting value to 10, new value is: ");
var_dump($prop->getValue($obj));

// Dump object
var_dump($obj);
?>

以上例程的输出类似于：

===> The public property 'length' (which was declared at compile-time)
     having the modifiers array (
  0 => 'public',
)
---> Value is: int(5)
---> Setting value to 10, new value is: int(10)
object(Str)#2 (1) {
  ["length"]=>
  int(10)
}

Example #2 Getting value from private and protected properties using ReflectionProperty class


<?php

class Foo {
    public $x = 1;
    protected $y = 2;
    private $z = 3;
}

$obj = new Foo;

$prop = new ReflectionProperty('Foo', 'y');
$prop->setAccessible(true);
var_dump($prop->getValue($obj)); // int(2)

$prop = new ReflectionProperty('Foo', 'z');
$prop->setAccessible(true);
var_dump($prop->getValue($obj)); // int(2)

?>

以上例程的输出类似于：

int(2)
int(3)

参见

ReflectionProperty::getName() - Gets property name
Constructors

User Contributed Notes

geoffsmiths at hotmail dot com 05-Jul-2017 12:20


At example #2: the comment // int(2) is stated while the value for the private property is actually 3. (private $z = 3;)



var_dump($prop->getValue($obj)); // This should be int(3)