Application examples of reflection in php

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Release: 2016-07-25 08:58:31
Original
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  1. /**
  2. * php reflection example
  3. * edit bbs.it-home.org
  4. */
  5. class Person{
  6. public $name;
  7. function __construct($name){
  8. $this->name=$name;
  9. }
  10. }
  11. interface Module{
  12. function execute();
  13. }
  14. class FtpModule implements Module{
  15. function setHost($host){
  16. print "FtpModule::setHost():$hostn";
  17. }
  18. function setUser($user){
  19. print "FtpModule::setUser():$usern";
  20. }
  21. function execute(){
  22. //something
  23. }
  24. }
  25. class PersonModule implements Module{
  26. function setPerson(Person $person){
  27. print "PersonModule::setPerson:{$person->name}n";
  28. }
  29. function execute(){
  30. //something
  31. }
  32. }
  33. class ModuleRunner{
  34. private $configData
  35. =array(
  36. "PersonModule"=>array('person'=>'bob'),
  37. "FtpModule"=>array('host'=>'example.com','user'=>'anon')
  38. );
  39. private $modules=array();
  40. function init(){
  41. $interface=new ReflectionClass('Module');
  42. foreach($this->configData as $modulename=>$params){
  43. $module_class=new ReflectionClass($modulename);//根据配置configData的名称,实例化ReflectionClass
  44. if(!$module_class->isSubclassOf($interface)){//检查反射得到了类是否是$interface的子类
  45. throw new Exception("unknown module type:$modulename");//不是Module子类则抛出异常
  46. }
  47. $module=$module_class->newInstance();//实例化一个FtpModule或者PersonModule对象
  48. foreach($module_class->getMethods() as $method){//获得类中的方法
  49. $this->handleMethod($module,$method,$params);
  50. }
  51. array_push($this->modules,$module);//将实例化的module对象放入$modules数组中
  52. }
  53. }
  54. function handleMethod(Module $module,ReflectionMethod $method,$params){
  55. $name=$method->getName();//获得方法名称
  56. $args=$method->getParameters();//获得方法中的参数
  57. 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
  58. return false;
  59. }
  60. $property=strtolower(substr($name,3));//讲方法名去掉set三个字母,作为参数
  61. if(!isset($params[$property])){//如果$params数组不包含某个属性,就返回false
  62. return false;
  63. }
  64. $arg_class=@$args[0]->getClass;//检查setter方法的第一个参数(且唯一)的数据类型
  65. if(empty($arg_class)){
  66. $method->invoke($module,$params[$property]);
  67. }else{
  68. $method->invoke($module,$arg_class->newInstance($params[$property]));
  69. }
  70. }
  71. }
  72. $test=new ModuleRunner();
  73. $test->init();
  74. ?>
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二,通过反射获取类的信息:

  1. /**
  2. * php reflection to obtain class information
  3. * edit bbs.it-home.org
  4. */
  5. class ReflectionUtil{
  6. static function getClassSource(ReflectionClass $class){
  7. $path=$class->getFileName();
  8. $lines=@file($path);
  9. $from=$class->getStartLine();
  10. $to=$class->getEndLine();
  11. $len=$to-$from+1;
  12. return implode(array_slice($lines,$from-1,$len));
  13. }
  14. }
  15. $classname="Person";
  16. $path="../practice/{$classname}.php";
  17. if(!file_exists($path)){
  18. throw new Exception("No such file as {$path}");
  19. }
  20. require_once($path);
  21. if(!class_exists($classname)){
  22. throw new Exception("No such class as {$classname}");
  23. }
  24. print ReflectionUtil::getClassSource(new ReflectionClass('Person'));
  25. ?>
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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