ReflectionClass::hasProperty

(PHP 5 >= 5.1.2, PHP 7, PHP 8)

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。

示例

示例 #1 ReflectionClass::hasProperty() 示例

<?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"));
?>

以上示例的输出类似于：

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

参见

ReflectionClass::hasConstant() - 检查常量是否已经定义
ReflectionClass::hasMethod() - 检查方法是否已定义

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＋添加备注

用户贡献的备注 3 notes

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dalguete at gmail dot com ¶

3 years ago

hasProperty() now is consistent with getProperty() and getProperties() methods, thanks to this fix https://bugs.php.net/bug.php?id=49719

hasProperty() no longer returns true in private properties from parent classes.

down

-1

dalguete at gmail dot com ¶

3 years ago

hasProperty() now is consistent with getProperty() and getProperties() methods, thanks to this fix https://bugs.php.net/bug.php?id=49719

hasProperty() no longer returns true in private properties.

down

-2

rwilczek at web-appz dot de ¶

15 years ago

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
}
?>