假设有一个类Person:
class Person { /** * For the sake of demonstration, we"re setting this private */ private $_allowDynamicAttributes = false; /** type=primary_autoincrement */ protected $id = 0; /** type=varchar length=255 null */ protected $name; /** type=text null */ protected $biography; public function getId() { return $this->id; } public function setId($v) { $this->id = $v; } public function getName() { return $this->name; } public function setName($v) { $this->name = $v; } public function getBiography() { return $this->biography; } public function setBiography($v) { $this->biography = $v; } }
通过ReflectionClass,我们可以得到Person类的以下信息:
1.常量 Contants
2.属性 Property Names
3.方法 Method Names
4.静态属性 Static Properties
5.命名空间 Namespace
6.Person类是否为final或者abstract
只要把类名"Person"传递给ReflectionClass就可以了:
$class = new ReflectionClass('Person');
获取属性(Properties):
$properties = $class->getProperties(); foreach($properties as $property) { echo $property->getName()."\n"; } // 输出: // _allowDynamicAttributes // id // name // biography
默认情况下,ReflectionClass会获取到所有的属性,private 和 protected的也可以。如果只想获取到private属性,就要额外传个参数:
$private_properties = $class->getProperties(ReflectionProperty::IS_PRIVATE);
可用参数列表:
ReflectionProperty::IS_STATIC ReflectionProperty::IS_PUBLIC ReflectionProperty::IS_PROTECTED ReflectionProperty::IS_PRIVATE
如果要同时获取public 和private 属性,就这样写:ReflectionProperty::IS_PUBLIC | ReflectionProperty::IS_PROTECTED
应该不会感觉陌生吧。
通过$property->getName()可以得到属性名,通过getDocComment可以得到写给property的注释。
foreach($properties as $property) { if($property->isProtected()) { $docblock = $property->getDocComment(); preg_match('/ type\=([a-z_]*) /', $property->getDocComment(), $matches); echo $matches[1]."\n"; } } // Output: // primary_autoincrement // varchar // text
有点不可思议了吧。竟然连注释都可以取到。
获取方法(methods):通过getMethods() 来获取到类的所有methods。返回的是ReflectionMethod对象的数组。不再演示。
最后通过ReflectionMethod来调用类里面的method。
$data = array("id" => 1, "name" => "Chris", "biography" => "I am am a PHP developer"); foreach($data as $key => $value) { if(!$class->hasProperty($key)) { throw new Exception($key." is not a valid property"); } if(!$class->hasMethod("get".ucfirst($key))) { throw new Exception($key." is missing a getter"); } if(!$class->hasMethod("set".ucfirst($key))) { throw new Exception($key." is missing a setter"); } // Make a new object to interact with $object = new Person(); // Get the getter method and invoke it with the value in our data array $setter = $class->getMethod("set".ucfirst($key)); $ok = $setter->invoke($object, $value); // Get the setter method and invoke it $setter = $class->getMethod("get".ucfirst($key)); $objValue = $setter->invoke($object); // Now compare if($value == $objValue) { echo "Getter or Setter has modified the data.\n"; } else { echo "Getter and Setter does not modify the data.\n"; } }
有点意思吧。