PHP Reflection Reflectionclass, Reflectionmethod

The PHP5 has a complete reflection API that adds the ability to reverse engineer classes, interfaces, functions, methods, and extensions.

What is reflection?

It refers to the PHP running state, extending the parsing PHP program, exporting or extracting details about classes, methods, properties, parameters, etc., including comments. This dynamic acquisition of information and the ability to dynamically invoke an object's methods is called the Reflection API. Reflection is an API that manipulates the meta-model of an object-oriented paradigm and is powerful in helping us to build complex, scalable applications.

The purpose is to automatically load plugins, automatically generate documents, and even to augment the PHP language.

The PHP reflection API consists of several classes that help us to access the program's metadata or to interact with the related annotations. With reflection we can obtain methods such as class implementations, create an instance of a class (unlike the one created with new), Invoke a method (also different from a regular call), pass a parameter, and invoke the static method of the class dynamically.

The Reflection API is a PHP built-in OOP technology extension that includes classes, exceptions, and interfaces that are used in combination to help us analyze other classes, interfaces, methods, properties, methods, and extensions. These OOP extensions are known as reflections.

Usually we use more of the Reflectionclass class and the Reflectionmethod class, for example:

<?phpclass 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;/** * Typ E=text null */protected $biography;p ublic 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;}}

First, through Reflectionclass, we can get the following information of the person class:

Constant contants

Property Names

Method names static

Property Static Properties

Namespace Namespace

Whether the person class is final or abstract

Does the person class have a method

Next reflect it, as long as the class name "person" is passed to Reflectionclass, you can:

$class = new Reflectionclass (' person '); The reflection class of this class is established $instance = $class->newinstanceargs ($args); The equivalent of instantiating the person class

1) Get Attributes (properties):

$properties = $class->getproperties (); foreach ($properties as $property) {echo $property->getname (). "\ n";} Output://_allowdynamicattributes//id//name//biography

By default, Reflectionclass will get all of the properties, private and protected can also. If you want to get only the private property, you need to pass an additional parameter:

$private _properties = $class->getproperties (reflectionproperty::is_private);

List of available parameters:

Reflectionproperty::is_static

Reflectionproperty::is_public

reflectionproperty::is_protected

Reflectionproperty::is_private

The property name can be obtained by $property->getname ().

2) Get Comments:

A note to the property can be obtained by getdoccomment.

foreach ($properties as $property) {if ($property->isprotected ()) {$docblock = $property->getdoccomment ();p reg_ Match ('/type\= ([a-z_]*)/', $property->getdoccomment (), $matches), Echo $matches [1]. "\ n";}} output://primary_autoincrement//varchar//Text

3) methods to get classes

GetMethods () to get all the methods to the class.

Hasmethod (string) whether there is a method

GetMethod (String) Get method

4) Method of executing the class:

$instance->getname (); Execute the method in person getname//or: $method = $class->getmethod (' getName ');//Get the GetName method in the Person class $method->invoke ($ Instance)/////or: $method = $class->getmethod (' setName ');//Get the SetName method in the person class $method-> Invokeargs ($instance, Array (' snsgou.com '));

Second, through Reflectionmethod, we can get information about a method of the person class:

"Public", "protected", "private", "static" type

Parameter list of the method

Number of parameters for the method

Sung methods of using classes

Execute Detail Method $method = new Reflectionmethod (' person ', ' test '); if ($method->ispublic () &&! $method IsStatic ()) {echo ' Action is Right ';} echo $method->getnumberofparameters (); Number of parameters echo $method->getparameters (); Array of Parameter objects

PHP Reflection Reflectionclass, Reflectionmethod