php小白问题

Question

<?phpclass Enum
{
protected $self=array();
public function _construct()
{
$args=func_get_args();
for($i=0,$n=count($args);$i<$n;$i++)
$this->add($args[$i]);
}
public function _get($name=null)
{
return $this->self[$name];
}
public function add($name=null,$enum=null)
{
if(isset($enum)) $this->self[$name]=$enum;
else $this->sef[$name]=end($this->self)+1;
}
}class DefinedEnum extends Enum
{
public function _construct($itms)
{
foreach($itms as $name=>$enum)
$this->add($name,$enum);
}
}class FlagsEnum extends Enum
{
public function _construct()
{
$args=func_get_args();
for($i=0,$n=count($args),$f=0x1;$i<$n;$i++,$f*=0x2)
$this->add($args[i],$f);
}
}$eFruits=new Enum("APPLE","ORANGE","PEACH");
echo $eFruits->APPLE.",";
echo $eFruits->ORANGE.",";
echo $eFruits->PEACH."\n";$eBeers=new DefinedEnum("GUINESS"=>25,"MIRROR_POND"=>49);
echo $eBeers->GUINESS.",";
echo $eBeers->MIRROR_POND."\n";$eFlags=new FlagsEnum("HAS_ADMIN","HAS_SUPER","HAS_POWER","HAS_GUEST");
echo $eFlags->HAS_ADMIN.",";
echo $eFlags->HAS_SUPER.",";
echo $eFlags->HAS_POWER.",";
echo $eFlags->HAS_GUEST."\n";
?>这段代码我怎么看不懂啊
哪里来的$eFruits->APPLE
 $eFruits->ORANGE
$eFruits->PEACH
不要见笑啊

Answer 1

1、你先把程序修改正确了：方法名前有下划线的方法名一律改成两个下划线的
如 _construct 改为 __construct2、修改 __get 方法成这样
    public function __get($name=null)
    {
        echo "读取属性 $name";
        return $this->self[$name];
    }
3、运行修改后的代码，你就可以知道是怎么回事了

Answer 2

 class Enum
{
    protected $self=array();
    public function __construct()
    {
        $args=func_get_args();
        for($i=0,$n=count($args);$i<$n;$i++)
            $this->add($args[$i]);
    }
    public function __get($name=null)
    {
        return $this->self[$name];
    }
    public function add($name=null,$enum=null)
    {
        if(isset($enum)){
    $this->self[$name]=$enum;
        }else{ 
           $this->self[$name]=end($this->self)+1;
}
    }
}class DefinedEnum extends Enum
{
    public function __construct($itms)
    {
        foreach($itms as $name=>$enum)
        $this->add($name,$enum);
    }
}class FlagsEnum extends Enum
{
    public function __construct()
    {
        $args=func_get_args();
        for($i=0,$n=count($args),$f=0x1;$i<$n;$i++,$f*=0x2){
            
 $this->add($args[$i],$f);
}
    }
} $eFruits=new Enum("APPLE","ORANGE","PEACH");
echo $eFruits->APPLE.",";
echo $eFruits->ORANGE.",";
echo $eFruits->PEACH."\n";$eBeers=new DefinedEnum(array("GUINESS"=>25,"MIRROR_POND"=>49));
echo $eBeers->GUINESS.",";
echo $eBeers->MIRROR_POND."\n"; $eFlags=new FlagsEnum("HAS_ADMIN","HAS_SUPER","HAS_POWER","HAS_GUEST");
echo ($eFlags->HAS_ADMIN).",";
echo ($eFlags->HAS_SUPER).",";
echo $eFlags->HAS_POWER.",";
echo $eFlags->HAS_GUEST."\n";