ReflectionClass::getProperties()

(PHP 5, PHP 7)

获取一组属性

说明

publicReflectionClass::getProperties([int $filter]): array

获取反射过的属性。

参数

$filter

可选的过滤器，过滤为所需类型的属性。它使用ReflectionProperty 常量来配置，默认获取所有类型的属性。

返回值

ReflectionProperty对象的数组。

范例

Example #1ReflectionClass::getProperties()过滤例子

这个例子延时了可选$filter参数的用法，例子里实际上忽略了私有属性。

<?php
class Foo {
    public    $foo  = 1;
    protected $bar  = 2;
    private   $baz  = 3;
}
$foo = new Foo();
$reflect = new ReflectionClass($foo);
$props   = $reflect->getProperties(ReflectionProperty::IS_PUBLIC | ReflectionProperty::IS_PROTECTED);
foreach ($props as $prop) {
    print $prop->getName() . "\n";
}
var_dump($props);
?>

以上例程的输出类似于：

foo
bar
array(2) {
  [0]=>
  object(ReflectionProperty)#3 (2) {
    ["name"]=>
    string(3) "foo"
    ["class"]=>
    string(3) "Foo"
  }
  [1]=>
  object(ReflectionProperty)#4 (2) {
    ["name"]=>
    string(3) "bar"
    ["class"]=>
    string(3) "Foo"
  }
}

参见

• ReflectionClass::getProperty() 获取类的一个属性的 ReflectionProperty
• ReflectionProperty
• ReflectionProperty 修饰符常量

Some may find this useful.
<?php
/**
 * Recursive function to get an associative array of class properties by property name => ReflectionProperty() object
 * including inherited ones from extended classes
 * @param string $className Class name
 * @param string $types Any combination of <b>public, private, protected, static</b>
 * @return array
 */
function getClassProperties($className, $types='public'){
  $ref = new ReflectionClass($className);
  $props = $ref->getProperties();
  $props_arr = array();
  foreach($props as $prop){
    $f = $prop->getName();
    
    if($prop->isPublic() and (stripos($types, 'public') === FALSE)) continue;
    if($prop->isPrivate() and (stripos($types, 'private') === FALSE)) continue;
    if($prop->isProtected() and (stripos($types, 'protected') === FALSE)) continue;
    if($prop->isStatic() and (stripos($types, 'static') === FALSE)) continue;
    
    $props_arr[$f] = $prop;
  }
  if($parentClass = $ref->getParentClass()){
    $parent_props_arr = getClassProperties($parentClass->getName());//RECURSION
    if(count($parent_props_arr) > 0)
      $props_arr = array_merge($parent_props_arr, $props_arr);
  }
  return $props_arr;
}
//USAGE
class A{
 public $a1;
  
  function abc(){
    //do something
  }
}
class AA extends A{
  public $a2;
  
  function edf(){
    //do something
  }
}
class AAA extends AA{
 //may not have extra properties, but may have extra methods
  function ghi(){
    //ok
  }
}
//$ref = new ReflectionClass('AAA'); $props = $ref->getProperties();//This will get no properties!
$props_arr = getClassProperties('AAA', 'public');//Use this 
var_dump($props_arr);
/*
OUTPUT on PHP5.2.6:
array
 'a1' => 
  object(ReflectionProperty)[4]
   public 'name' => string 'a1' (length=2)
   public 'class' => string 'AAA' (length=3)
 'a2' => 
  object(ReflectionProperty)[3]
   public 'name' => string 'a2' (length=2)
   public 'class' => string 'AAA' (length=3)
*/
?>

Note that inherited properties are returned, but no private properties of parent classes. Depending on the use case, you need to check that, too.
do {
  foreach ($reflectionClass->getProperties() as $property) {
    /* ... */
  }
} while ($reflectionClass = $reflectionClass->getParentClass());

The code in the first example actually does get inherited properties with at least php 5.5.9 . I don't know if / when this behavior changed.
Here is the output:
  array(2) {
   [0] =>
   class ReflectionProperty#2 (2) {
    public $name =>
    string(2) "a2"
    public $class =>
    string(2) "AA"
   }
   [1] =>
   class ReflectionProperty#3 (2) {
    public $name =>
    string(2) "a1"
    public $class =>
    string(1) "A"
   }
  }

It should be noted that the 'filter' parameter in the getProperties(filter) method is expected to be of type long. Not sure why, but it doesn't function as a way of passing in a string to fetch a subset of properties by string match.

With PHP 5.3 protected or private properties are easy to access with setAccessible(). However, it's sometimes needed (e.g. Unit Tests) and here is a workaround for getValue():
<?php
$class = new ReflectionClass('SomeClass');
$props = $class->getProperties();
// $propsStatic = $class->getStaticProperties();
$myPrivatePropertyValue = $props['aPrivateProperty'];
?>
Note that it wont work if you access the property directly with getProperty().

Looks like you can access public, protected, private variables by casting the object to an array (useful for Unit Testing). However casting to an array still won't allow you access to protected and private static variables.
In PHP 5.3.0+ use ReflectionProperty::setAccessable(true);
<?php
echo "PHP Version: ".phpversion()."\n";
class Foo {
  public  $foo = 'public';
  protected $bar = 'protected';
  private  $baz = 'private';
  public static  $sfoo = 'public static';
  protected static $sbar = 'protected static';
  private static  $sbaz = 'private static';
  const COO = 'const';
}
$obj = new Foo;
$arr = (array)$obj;
print_r($arr);
echo "Accessing Public Static: ".Foo::$sfoo."\n";
// echo Foo::$sbar."\n"; // Fatal error: Cannot access protected property Foo::$sbar
// echo Foo::$sbaz."\n"; // Fatal error: Cannot access private property Foo::$sbaz
echo "Accessing Constant: ".Foo::COO."\n";
?>
PHP Version: 5.2.12
Array
(
  [foo] => public
  [*bar] => protected
  [Foobaz] => private
)
Accessing Public Static: public static
Accessing Constant: const
PHP Version: 5.1.6
Array
(
  [foo] => public
  [*bar] => protected
  [Foobaz] => private
)
Accessing Public Static: public static
Accessing Constant: const