Application examples of reflection in php
Release: 2016-07-25 08:58:31
Original
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-
- /**
- * php reflection example
- * edit bbs.it-home.org
- */
- 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();
- ?>
复制代码
二,通过反射获取类的信息:
-
- /**
- * php reflection to obtain class information
- * edit bbs.it-home.org
- */
- class ReflectionUtil{
- static function getClassSource(ReflectionClass $class){
- $path=$class->getFileName();
- $lines=@file($path);
- $from=$class->getStartLine();
- $to=$class->getEndLine();
- $len=$to-$from+1;
- return implode(array_slice($lines,$from-1,$len));
- }
- }
- $classname="Person";
- $path="../practice/{$classname}.php";
- if(!file_exists($path)){
- throw new Exception("No such file as {$path}");
- }
- require_once($path);
- if(!class_exists($classname)){
- throw new Exception("No such class as {$classname}");
- }
- print ReflectionUtil::getClassSource(new ReflectionClass('Person'));
- ?>
复制代码
输出结果:
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; } } |
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