Analyze the application of reflection in php

高洛峰
Release: 2023-03-04 07:44:02
Original
853 people have browsed it

1 The use of reflection:

name=$name; } } interface Module{ function execute(); } class FtpModule implements Module{ function setHost($host){ print "FtpModule::setHost():$host\n"; } function setUser($user){ print "FtpModule::setUser():$user\n"; } 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(); ?>
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2 Obtaining information in the class through reflection:

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')); ?>

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; } }
        

        

        

        

        
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