ReflectionProperty::__construct

(PHP 5, PHP 7)

ReflectionProperty::__construct — Construct a ReflectionProperty object

说明

public ReflectionProperty::__construct ( mixed $class , string $name )

Warning

本函数还未编写文档，仅有参数列表。

参数

class

The class name, that contains the property.

name

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');
$prop->setAccessible(true); /* As of PHP 5.3.0 */
var_dump($prop->getValue($obj)); // int(2)

$prop = new ReflectionProperty('Foo', 'z');
$prop->setAccessible(true); /* As of PHP 5.3.0 */
var_dump($prop->getValue($obj)); // int(2)

?>

以上例程的输出类似于：

int(2)
int(3)

参见

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)