php教程

ReflectionClass::hasProperty

(PHP 5 >= 5.1.2, PHP 7)

ReflectionClass::hasProperty检查属性是否已定义

说明

public ReflectionClass::hasProperty ( string $name ) : bool

检查指定的属性是否已定义。

参数

name

待检查的属性的名称。

返回值

如果有这个属性返回 TRUE,否则返回 FALSE

范例

Example #1 ReflectionClass::hasProperty() 例子

<?php
class Foo {
    public    
$p1;
    protected 
$p2;
    private   
$p3;

}

$obj = new ReflectionObject(new Foo());

var_dump($obj->hasProperty("p1"));
var_dump($obj->hasProperty("p2"));
var_dump($obj->hasProperty("p3"));
var_dump($obj->hasProperty("p4"));
?>

以上例程的输出类似于:

bool(true)
bool(true)
bool(true)
bool(false)

参见

User Contributed Notes

rwilczek at web-appz dot de 13-Oct-2009 05:40
Note, that this method does not guarantee, that you can get a property with ReflectionClass::getProperty().

ReflectionClass::hasProperty() considers the parent classes (ignoring however, that a private property is not inherited), while ReflectionClass::getProperty() and ReflectionClass::getProperties() don't care about inheritance.

(Tested with PHP 5.3.0)

<?php
class Foo
{
    private
$x;
}

class
Bar extends Foo
{
   
//
}

$foo = new ReflectionClass('Foo');
$bar = new ReflectionClass('Bar');

var_dump($foo->hasProperty('x'); // bool(true)
var_dump($bar->hasProperty('x'); // bool(true)

var_dump(get_class($foo->getProperty('x'))); //string(18) "ReflectionProperty"
try {
   
$bar->getProperty('x');
} catch (
ReflectionException $e) {
    echo
$e->getMessage(); // Property x does not exist
}
?>

CopyRight © 2008-2022 verySource.Com All Rights reserved. 京ICP备17048824号-1 京公网安备:11010502034788