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class classname {
    public $attribute;
    function __get($name) {
        return $this->$name;
    }
    function __set($name, $value){
        $this->$name = $value;
   }
}
3.´Ë·ÃÎÊÆ÷º¯ÊýµÄÔ­Àí¾ÍÊÇÕâÑù£ºÖ»Ê¹ÓÃÒ»¶Î´úÂëÀ´·ÃÎÊÌØ¶¨ÊôÐÔ¡£ÓÉÓÚÖ»ÓÐÒ»¸öÈë¿Ú£¬¾Í¿ÉÒÔ¶ÔÒª±£´æµÄÊý¾Ý½øÐмì²é£¬¿ÉÒÔÈ·±£±£´æµÄÊý
¾ÝÊÇÓÐÒâÒåµÄÊý¾Ý¡£ÀýÈç:
function _set ($name, $value) {
    if( ($name == "attribute") && ($value >= 0) && ($value <= 100) ) {
        $this->attribute = $value;
    }
}
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5.__get(),__set(),__isset(),__unset().
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//__get()·½·¨ÓÃÀ´»ñȡ˽ÓÐÊôÐÔ.
private function __get($property_name) {
    if (isset($this -> property_name)) {
        return($this -> $property_name);
    } else {
        return(NULL);
    }
}
//__set()·½·¨ÉèÖÃ˽ÓÐÊôÐÔ
private function __set($property_name,$value) {
    $this -> $property_name = $value;
}
//__isset()·½·¨¿ÉÒÔÉèΪ˽ÓÐ
private function __isset($property_name) {


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