ReflectionClass::hasProperty()

(PHP 5 >= 5.1.2, PHP 7)

检查属性是否已定义

说明

publicReflectionClass::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 #1ReflectionClass::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

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
}
?>