PHP 反射(Reflection)使用实例

php reflection是用于获取类、扩展、方法、函数、对象、参数、属性的详细信息。
reflectionclass类获取类相关信息，如获取属性、方法、文档注释等。

<?php
 
class person {
  /**
   * for the sake of demonstration, we"re setting this private
   */
  private $_allowdynamicattributes = false;
 
  /** type=primary_autoincrement */
  protected $id = 0;
 
  /** type=varchar length=255 null */
  protected $name;
 
  /** type=text null */
  protected $biography;
 
  public function getid()
  {
    return $this->id;
  }
  public function setid($v)
  {
    $this->id = $v;
  }
  public function getname()
  {
    return $this->name;
  }
  public function setname($v)
  {
    $this->name = $v;
  }
  public function getbiography()
  {
    return $this->biography;
  }
  public function setbiography($v)
  {
    $this->biography = $v;
  }
}
 
//导出类
reflectionclass::export('person');
 
$r = new reflectionclass('person');
 
//获取所有属性
print_r($r->getproperties());
 
/**
 * 获取指定属性
 * reflectionproperty::is_static
 * reflectionproperty::is_public
 * reflectionproperty::is_protected
 * reflectionproperty::is_private
 */
print_r($r->getproperties(reflectionproperty::is_private));
 
//获取注释
print_r($r->getproperty('id')->getdoccomment());
 
//获取方法
print_r($r->getmethods());

reflectionextension 类用于获取扩展相关信息

$re = new reflectionextension('reflection');
print_r($re->getclasses()); //扩展的所有类
print_r($re->getclassnames()); //扩展所有类名
 
$dom = new reflectionextension('mysql');
print_r($dom->getconstants());//扩展常量
print_r($dom->getdependencies());//该扩展依赖
print_r($dom->getfunctions());//扩展方法
print_r($dom->getinientries());//扩展ini信息
print_r($dom->getname());//扩展名称
print_r($dom->getversion());//扩展版本
print_r($dom->info());//扩展信息
print_r($dom->ispersistent());//是否是持久扩展
print_r($dom->istemporary()); //是否是临时扩展

 reflectionfunction类 用户获取函数相关信息

$rf = new reflectionfunction('array_merge');
 
foreach($rf->getparameters() as $item) {
  echo $item . php_eol;
}

reflectionmethod类用户获取方法相关信息

class person {
 
  public $name;
 
  /**
   * get name of person
   */
  public function getname()
  {
    return $this->name;
  }
  public function setname($v)
  {
    $this->name = $v;
  }
}
 
$rm = new reflectionmethod('person', 'getname');
 
print_r($rm->ispublic());
print_r($rm->getdoccomment());

reflectionobject 类 用于获取对象相关信息

class person {
 
  public $name;
 
  public function __construct($name)
  {
    $this->name = $name;
  }
  
  public function getname()
  {
    return $this->name;
  }
  
  public function setname($v)
  {
    $this->name = $v;
  }
}
 
$a = new person('a');
 
$ro = new reflectionobject($a);
 
print_r($ro->getmethods());

reflectionparameter 获取函数或方法参数的相关信息。

class person {
 
  public $name;
 
  public function __construct($name)
  {
    $this->name = $name;
  }
 
  public function getname()
  {
    return $this->name;
  }
 
  public function setname($v)
  {
    $this->name = $v;
  }
}
 
$p = new reflectionparameter(array('person', 'setname'), 0);
 
print_r($p->getposition()); //0
print_r($p->getname()); //v

reflectionproperty 获取类的属性的相关信息。

class person {
 
  /** 测试 */
  public $name;
 
  public function __construct($name)
  {
    $this->name = $name;
  }
 
  public function getname()
  {
    return $this->name;
  }
 
  public function setname($v)
  {
    $this->name = $v;
  }
}
 
$p = new reflectionproperty('person', 'name');
 
print_r($p->getdoccomment());