通过引用处理__get（） [英] Working with __get() by reference

问题描述

使用一个如下所示的示例类：

  class Test {
 public function& __ get（$ name ）{
 print_r（$ name）; 
 
 
 
 
 $ b 
  Test的一个实例会反弹输出： 
 
 
  $ myTest = new Test; 
 $ myTest-> foo ['bar'] ['hello'] ='world'; 
 //输出只有foo 
  
有没有办法获得更多关于什么维度的信息的数组正在被访问，向我展示（来自前面的例子） foo 的 bar 元素，以及 hello   bar 元素是否有针对性？  
 
解决方案
你不能用当前的实现。为了达到这个目的，你必须创建一个数组对象（即：一个实现 ArrayAccess 的对象）。例如： 
 
 
  class SuperArray实现ArrayAccess {
 protected $ _data = array（）; 
 protected $ _parents = array（）; 
 
 public function __construct（array $ data，array $ parents = array（））{
 $ this-> _parents = $ parents; 
 foreach（$ data as $ key => $ value）{
 if（is_array（$ value））{
 $ value = new SuperArray（$ value，array_merge（$ this-> ; _parents，array（$ key）））; 
} 
 $ this [$ key] = $ value; 
 
 
 
 public function offsetGet（$ offset）{
 if（！empty（$ this-> _parents））echo['.implode （'] ['，$ this-> _parents）。']; 
 echo['$ offset']正在被访问......; 
返回$ this-> _data [$ offset]; 
} 
 
 public function offsetset（$ offset，$ value）{
 if（$ offset ===''）$ this-> _data [] = $ value; 
 else $ this-> _data [$ offset] = $ value; 
} 
 
 public function offsetUnset（$ offset）{
 unset（$ this-> _data [$ offset]）; 
} 
 
公共函数offsetExists（$ offset）{
 return isset（$ this-> _data [$ offset]）; 
} 
} 
 
 class Test {
 protected $ foo; 
 
 public function __construct（）{
 $ array ['bar'] ['hello'] ='world'; 
 $ this-> foo = new SuperArray（$ array）; 
} 
 
公共函数__get（$ name）{
 echo $ name。'正在被访问。'。PHP_EOL; 
返回$ this-> $ name; 
} 
} 
 
 $ test = new Test; 
 echo $ test-> foo ['bar'] ['hello']; 
  
应输出： 
 
 
正在访问 foo。正在访问
 ['bar'] 
 ['bar'] ['hello']正被访问
 world 
  
 
With an example class such as this:
class Test{
    public function &__get($name){
        print_r($name);
    }
}
An instance of Test will kick back output as such:
$myTest = new Test;
$myTest->foo['bar']['hello'] = 'world';
//outputs only foo
Is there a way I can get more information about what dimension of the array is being accessed, showing me (from the previous example) that the bar element of foo, and the hello element of bar are being targeted?
解决方案
You can't with the current implementation. In order for this to work, you will have to create an array object (i.e.: an object that implements ArrayAccess). Something like:
class SuperArray implements ArrayAccess {
    protected $_data = array();
    protected $_parents = array();

    public function __construct(array $data, array $parents = array()) {
        $this->_parents = $parents;
        foreach ($data as $key => $value) {
            if (is_array($value)) {
                $value = new SuperArray($value, array_merge($this->_parents, array($key)));
            }
            $this[$key] = $value;
        }
    }

    public function offsetGet($offset) {
        if (!empty($this->_parents)) echo "['".implode("']['", $this->_parents)."']";
        echo "['$offset'] is being accessed\n";
        return $this->_data[$offset];
    } 

    public function offsetSet($offset, $value) {
        if ($offset === '') $this->_data[] = $value;
        else $this->_data[$offset] = $value;
    } 

    public function offsetUnset($offset) {
        unset($this->_data[$offset]);
    } 

    public function offsetExists($offset) {
        return isset($this->_data[$offset]);
    } 
}

class Test{
    protected $foo;

    public function __construct() {
        $array['bar']['hello'] = 'world';
        $this->foo = new SuperArray($array); 
    }

    public function __get($name){
        echo $name.' is being accessed.'.PHP_EOL;
        return $this->$name;
    }
}

$test = new Test;
echo $test->foo['bar']['hello'];
Should output:
foo is being accessed.
['bar'] is being accessed
['bar']['hello'] is being accessed
world


                        
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