ReflectionClass::hasProperty
(PHP 5 >= 5.1.0)
ReflectionClass::hasProperty — 检查属性是否已定义
说明
$name
)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
- ReflectionClass::hasConstant() - 检查常量是否已经定义
- ReflectionClass::hasMethod() - 检查方法是否已定义
用户评论:
[#1] rwilczek at web-appz dot de [2009-10-13 05:40:20]
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
}
?>