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());