ReflectionClass
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ReflectionClass::hasProperty

(PHP 5 >= 5.1.0)

ReflectionClass::hasProperty — Checks if property is defined

说明

public bool ReflectionClass::hasProperty ( string $name )

Checks whether the specified property is defined.

参数

name

Name of the property being checked for.

返回值

TRUE if it has the property, otherwise FALSE

范例

Example #1 ReflectionClass::hasProperty() example

<?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

ReflectionClass
在线手册：中文 英文
PHP手册
PHP手册 - N: Checks if property is defined

用户评论:

rwilczek at web-appz dot de (13-Oct-2009 01:40)

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
}
?>