使用PHP的反射Reflection获取对象信息

转载地址：http://www.nowamagic.net/librarys/veda/detail/909

PHP5添加了一项新的功能：Reflection。这个功能使得程序员可以reverse-engineer class, interface,function,method and extension。通过PHP代码，就可以得到某object的所有信息，并且可以和它交互

php反射API 获取属性/注释/方法 执行方法 实例

<?php
 
class Person
{
    /**
     * 这里是对$_allowDynamicAttributes的注释信息
     */
    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;
    }
}
 
$class = new ReflectionClass('Person'); //建立Person这个类的反射类
$instance = $class->newInstanceArgs();  //相当于实例化Person类
//var_dump($instance);
//1 获取属性(Properties):
echo "<h1>获取属性</h1>";
$properties = $class->getProperties();
foreach ($properties as &$property)
{
    echo $property->getName()."<BR>";
}
//默认情况下，ReflectionClass会取所有的属性，private 和protected的也可以
//如果只想获取到private属性，就要额外传个参数
//可用参数列表:
// $private_properties = $class->getProperties(ReflectionProperty::IS_PRIVATE);
// 可用参数列表
    //ReflectionProperty::IS_STATIC
    //ReflectionProperty::IS_PUBLIC
    //ReflectionProperty::IS_PROVATE
    //ReflectionProperty::IS_PROECTED
//如果要同时获取public 和private 属性，就这样写：ReflectionProperty::IS_PUBLIC | ReflectionProperty::IS_PROTECTED。
 
 
echo "<h1>获取注释</h1>";
//获取注释
foreach($properties as &$property)
{
    if($property->isProtected())  ////测试该方法是否为protected
    {
        $docblock = $property->getDocComment();
        preg_match('/ type\=([a-z_]*) /', $property->getDocComment(), $matches);  
        echo $matches[1]."<BR><BR>";
 
    }
}
 
//获取类的方法
//获取方法(methods):通过getMethods()来获取到类的所有methods
 
//执行类的方法
$instance->setBiography(22);
echo $instance->getBiography(); //执行Person里面的方法getBiography
 
//或者
$ec = $class->getMethod('setName');
$ec->invoke($instance,'xlc');
 
$ec2 = $class->getMethod('getName');
echo $ec2->invoke($instance);
 
?>

自己操作实例如下：

<?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;

    /** type=text null */
    public function getId()
    {
return $this->id;
    }
/** type=text null */
    public function setId($v)
    {
$this->id = $v;
    }
/** type=text null */
    public function getName()
    {
return $this->name;
    }
/** type=text null */
    public function setName($v)
    {
$this->name = $v;
    }
/** type=text null */
    public function getBiography()
    {
return $this->biography;
    }

/** type=text null */
    public function setBiography($v)
    {
$this->biography = $v;
    }
}


$class = new ReflectionClass('Person');
$properties = $class->getProperties();
echo 'this is property -----'."<br>";
foreach($properties as $property) {
echo $property->getName()."<br/>";
}

echo 'this is property document-----'."<br>";
// 输出:
// _allowDynamicAttributes
// id
// name
// biography


foreach($properties as $property) {
if($property->isProtected()) {
//$docblock = $property->getDocComment();
        preg_match('/ type=([a-z_]*) /', $property->getDocComment(), $matches);
        echo $matches[1]."<br/>";
    }
}
// Output:
// primary_autoincrement
// varchar
// text
$methods = $class->getMethods();


echo 'this is method -----'."<br>";
foreach($methods as $method) {
echo $method->getName()."<br/>";
}

echo 'this is method document-----'."<br>";
foreach($methods as $method) {
//if($method->isProtected()) {
        //$docblock = $method->getDocComment();
        preg_match('/ type=([a-z_]*) /', $method->getDocComment(), $matches);
        echo $matches[1]."<br/>";
    //}
}

输出如下：