PHP反射实际应用示例

<?php
class Student
{
  const NORMAL = 1;
  const FORBIDDEN = 2;
  /**
   * 用户ID
   * @var 类型
   */
  public $id;
  /**
   * 获取id
   * @return int
   */
  public function getId()
  {
    return $this->id;
  }
  public function setId($id = 1)
  {
    $this->id = $id;
  }
}
$ref = new ReflectionClass('Student');
$doc = $ref->getDocComment();
echo $ref->getName() . ':' . getComment($ref) , "<br/>";
echo "属性列表：<br/>";
printf("%-15s%-10s%-40s<br/>", 'Name', 'Access', 'Comment');
$attr = $ref->getProperties();
foreach ($attr as $row) {
  printf("%-15s%-10s%-40s<br/>", $row->getName(), getAccess($row), getComment($row));
}
echo "常量列表：<br/>";
printf("%-15s%-10s<br/>", 'Name', 'Value');
$const = $ref->getConstants();
foreach ($const as $key => $val) {
  printf("%-15s%-10s<br/>", $key, $val);
}
echo "<br/><br/>";
echo "方法列表<br/>";
printf("%-15s%-10s%-30s%-40s<br/>", 'Name', 'Access', 'Params', 'Comment');
$methods = $ref->getMethods();
foreach ($methods as $row) {
  printf("%-15s%-10s%-30s%-40s<br/>", $row->getName(), getAccess($row), getParams($row), getComment($row));
}
// 获取权限
function getAccess($method)
{
  if ($method->isPublic()) {
    return 'Public';
  }
  if ($method->isProtected()) {
    return 'Protected';
  }
  if ($method->isPrivate()) {
    return 'Private';
  }
}
// 获取方法参数信息
function getParams($method)
{
  $str = '';
  $parameters = $method->getParameters();
  foreach ($parameters as $row) {
    $str .= $row->getName() . ',';
    if ($row->isDefaultValueAvailable()) {
      $str .= "Default: {$row->getDefaultValue()}";
    }
  }
  return $str ? $str : '';
}
// 获取注释
function getComment($var)
{
  $comment = $var->getDocComment();
  // 简单的获取了第一行的信息，这里可以自行扩展
  preg_match('/\* (.*) *?/', $comment, $res);
  return isset($res[1]) ? $res[1] : '';
}

$class = new ReflectionClass(ucfirst($controller) . 'Controller');
$controller = $class->newInstance();
if ($class->hasMethod($method)) {
  $method = $class->getMethod($method);
  $method->invokeArgs($controller, $arguments);
} else {
  throw new Exception("{$controller} controller method {$method} not exists!");
}

<?php
class Calc
{
  public function plus($a, $b)
  {
    return $a + $b;
  }
  public function minus($a, $b)
  {
    return $a - $b;
  }
}
function testEqual($method, $assert, $data)
{
  $arr = explode('@', $method);
  $class = $arr[0];
  $method = $arr[1];
  $ref = new ReflectionClass($class);
  if ($ref->hasMethod($method)) {
    $method = $ref->getMethod($method);
    $res = $method->invokeArgs(new $class, $data);
    if($res === $assert){
      echo "测试结果正确";
    };
  }
}
testEqual('Calc@plus', 3, [1, 2]);
echo "<br/>";
testEqual('Calc@minus', -1, [1, 2]);

<?php
function title($title, $name)
{
  return sprintf("%s. %s\r\n", $title, $name);
}
$function = new ReflectionFunction('title');
echo $function->invokeArgs(array('Dr', 'Phil'));
?>

<?php
class DI
{
  protected static $data = [];
  public function __set($k, $v)
  {
    self::$data[$k] = $v;
  }
  public function __get($k)
  {
    return $this->bulid(self::$data[$k]);
  }
  // 获取实例
  public function bulid($className)
  {
    // 如果是匿名函数，直接执行，并返回结果
    if ($className instanceof Closure) {
      return $className($this);
    }
    // 已经是实例化对象的话，直接返回
    if(is_object($className)) {
      return $className;
    }
    // 如果是类的话，使用反射加载
    $ref = new ReflectionClass($className);
    // 监测类是否可实例化
    if (!$ref->isInstantiable()) {
      throw new Exception('class' . $className . ' not find');
    }
    // 获取构造函数
    $construtor = $ref->getConstructor();
    // 无构造函数，直接实例化返回
    if (is_null($construtor)) {
      return new $className;
    }
    // 获取构造函数参数
    $params = $construtor->getParameters();
    // 解析构造函数
    $dependencies = $this->getDependecies($params);
    // 创建新实例
    return $ref->newInstanceArgs($dependencies);
  }
  // 分析参数，如果参数中出现依赖类，递归实例化
  public function getDependecies($params)
  {
    $data = [];
    foreach($params as $param)
    {
      $tmp = $param->getClass();
      if (is_null($tmp)) {
        $data[] = $this->setDefault($param);
      } else {
        $data[] = $this->bulid($tmp->name);
      }
    }
    return $data;
  }
  // 设置默认值
  public function setDefault($param)
  {
    if ($param->isDefaultValueAvailable()) {
      return $param->getDefaultValue();
    }
    throw new Exception('no default value!');
  }
}
class Demo
{
  public function __construct(Calc $calc)
  {
    echo $calc->plus(1, 2);
  }
}
class Calc
{
  public function plus($a, $b)
  {
    return $a + $b;
  }
  public function minus($a, $b)
  {
    return $a - $b;
  }
}
$di = new DI();
$di->calc = 'Calc';
$di->demo = 'Demo';
$di->demo;//输出结果为3