Introduction to PHP's Reflection reflection mechanism
This article mainly introduces the reflection mechanism of PHP. It has certain reference value. Now I share it with you. Friends in need can refer to it
PHP5 adds a new feature: Reflection. This feature allows programmers to
reverse-engineer[reverse engineering] class, interface, function, method and extension[extension library support].
Through PHP code, you can get all the information of an object and interact with it.
Assume the following Person class:
1 class Person {
2 /**
3 * For the sake of demonstration, we"re setting this private
4 */
5 private $_allowDynamicAttributes = false;
6
7 /**
8 * type=primary_autoincrement
9 */
10 protected $id = 0;
11
12 /**
13 * type=varchar length=255 null
14 */
15 protected $name;
16
17 /**
18 * type=text null19 */
20 protected $biography;
21 public function getId() {
22 return $this->id;
23 }
24 public function setId($v) {
25 $this->id = $v;
26 }
27 public function getName() {
28 return $this->name;
29 }
30 public function setName($v) {
31 $this->name = $v;
32 }
33 public function getBiography() {
34 return $this->biography;
35 }
36 public function setBiography($v) {
37 $this->biography = $v;
38 }
39 }Through ReflectionClass, we can get the following information of the Person class:
ConstantContants
Property Property Names
Method Names
Static PropertiesStatic Properties
-
NamespaceNamespace
Whether the Person class is final or abstract
Just pass the class name "Person" to ReflectionClass :
1 $class = new ReflectionClass('Person');* Get properties (Properties):
1 $properties = $class->getProperties();2 foreach($properties as $property) {
3 echo $property->getName()."\n";4 }
5 // 输出:6 // _allowDynamicAttributes7 // id8 // name9 // biographyBy default, ReflectionClass will get all properties, including private and protected ones. If you only want to get the private attribute, you need to pass an additional parameter:
1 $private_properties = $class->getProperties(ReflectionProperty::IS_PRIVATE);
Available parameter list:
- ##ReflectionProperty::IS_STATIC
- ReflectionProperty::IS_PUBLIC
- ReflectionProperty::IS_PROTECTED
- ReflectionProperty::IS_PRIVATE
1 foreach($properties as $property) {
2 if($property->isProtected()) {
3 $docblock = $property->getDocComment();
4 preg_match('/ type\=([a-z_]*) /', $property->getDocComment(), $matches);
5 echo $matches[1]."\n";
6 }
7 }
8 // Output:
9 // primary_autoincrement
10 // varchar
11 // text$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 compare
if($value == $objValue) {
echo "Getter or Setter has modified the data.\n";
} else {
echo "Getter and Setter does not modify the data.\n";
}
}php method of crawling web content and images
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