Analyze the application of reflection in php_PHP tutorial
一 反射的使用:
class Person{
public $name;
function __construct($name){
$this->name=$name;
}
}
interface Module{
function execute();
}
class FtpModule implements Module{
function setHost($host){
print "FtpModule::setHost():$hostn";
}
function setUser($user){
print "FtpModule::setUser():$usern";
}
function execute(){
//something
}
}
class PersonModule implements Module{
function setPerson(Person $person){
print "PersonModule::setPerson:{$person->name}n";
}
function execute(){
//something
}
}
class ModuleRunner{
private $configData
=array(
"PersonModule"=>array('person'=>'bob'),
"FtpModule"=>array('host'=>'example.com','user'=>'anon')
);
private $modules=array();
function init(){
$interface=new ReflectionClass('Module');
foreach($this->configData as $modulename=>$params){
$module_class=new ReflectionClass($modulename);//根据配置configData的名称,实例化ReflectionClass
if(!$module_class->isSubclassOf($interface)){//检查反射得到了类是否是$interface的子类
throw new Exception("unknown module type:$modulename");//不是Module子类则抛出异常
}
$module=$module_class->newInstance();//实例化一个FtpModule或者PersonModule对象
foreach($module_class->getMethods() as $method){//获得类中的方法
$this->handleMethod($module,$method,$params);
}
array_push($this->modules,$module);//将实例化的module对象放入$modules数组中
}
}
function handleMethod(Module $module,ReflectionMethod $method,$params){
$name=$method->getName();//获得方法名称
$args=$method->getParameters();//获得方法中的参数
if(count($args)!=1||substr($name,0,3)!="set"){//检查方法必须是以set开头,且只有一个参数
return false;
}
$property=strtolower(substr($name,3));//讲方法名去掉set三个字母,作为参数
if(!isset($params[$property])){//如果$params数组不包含某个属性,就返回false
return false;
}
$arg_class=@$args[0]->getClass;//检查setter方法的第一个参数(且唯一)的数据类型
if(empty($arg_class)){
$method->invoke($module,$params[$property]);
}else{
$method->invoke($module,$arg_class->newInstance($params[$property]));
}
}
}
$test=new ModuleRunner();
$test->init();
?>
二 通过反射获得类中信息:
<?php<BR>class ReflectionUtil{<BR> static function getClassSource(ReflectionClass $class){<BR> $path=$class->getFileName();<br> $lines=@file($path);<br> $from=$class->getStartLine();<br> $to=$class->getEndLine();<br> $len=$to-$from+1;<br> return implode(array_slice($lines,$from-1,$len));<br> }<br>}<br>$classname="Person";<br>$path="../practice/{$classname}.php";<br>if(!file_exists($path)){<br> throw new Exception("No such file as {$path}");<br>}<br>require_once($path);<br>if(!class_exists($classname)){<br> throw new Exception("No such class as {$classname}");<br>}<br>print ReflectionUtil::getClassSource(new ReflectionClass('Person'));<br>?><br>
结果是:class Person{ public $age; public $name; function getName(){return "zjx";} function getAge(){return 12;} function __toString(){ $rs=$this->getName(); $rs.="(age".$this->getAge().")"; return $rs; } }

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
