实例介绍PHP的Reflection反射机制

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;
        }
}

$class = new ReflectionClass('Person');

$properties = $class->getProperties();
foreach($properties as $property) {
    echo $property->getName()."\n";
}
// 输出:
// _allowDynamicAttributes
// id
// name
// biography

$private_properties = $class->getProperties(ReflectionProperty::IS_PRIVATE);

ReflectionProperty::IS_STATIC
ReflectionProperty::IS_PUBLIC
ReflectionProperty::IS_PROTECTED
ReflectionProperty::IS_PRIVATE

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

$data = array("id" => 1, "name" => "Chris", "biography" => "I am am a PHP developer");
foreach($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 pare
    if($value == $objValue) {
        echo "Getter or Setter has modified the data.\n";
    } else {
        echo "Getter and Setter does not modify the data.\n";
   }
}