class Editor { var $Error = '' ; var $Pages; function vol() { $Pages = array(); $this->Pages[] = new page; } }
class Page { var $Id = ''; var $BackImage; function vol() { $BackImage = array(); // $this->$BackImage[] = new Decorator; //Fatal error: Cannot use [] for reading $this->BackImage[] = new Decorator; //只能这样写,因为 $BackImage 是数组 } }
class Decorator { var $Ext = ''; }
$Editor = new Editor; $Editor->vol(); $Editor->Pages[0]->vol();
$Editor->Pages[0]->BackImage[0]->Ext = 'str' ; $Editor->Pages[2]->BackImage[2]->Ext = 'str2'; //Warning: Creating default object from empty value 连语法检查都通不过!
{
var $Error = '' ;
var $Pages;
function vol()
{
$Pages = array();
$this->Pages[] = new page;
}
}
class Page
{
var $Id = '';
var $BackImage;
function vol()
{
$BackImage = array();
// $this->$BackImage[] = new Decorator; //Fatal error: Cannot use [] for reading
$this->BackImage[] = new Decorator; //只能这样写,因为 $BackImage 是数组
}
}
class Decorator
{
var $Ext = '';
}
$Editor = new Editor;
$Editor->vol();
$Editor->Pages[0]->vol();
$Editor->Pages[0]->BackImage[0]->Ext = 'str' ;
$Editor->Pages[2]->BackImage[2]->Ext = 'str2'; //Warning: Creating default object from empty value
连语法检查都通不过!
//我在使用这个类的时候
$Editor = new Editor;
$Editor->vol();
$Editor->Pages[0]->vol(); //对象定义完成?我只初始化了Pages[0]下的class Decorator对象,
//为什么下面我可以直接使用page[2]和所有page数组其他元素中的class Decorator ,
//而不需要我$Editor->Pages[2]->vol()呢?
//$Editor->name = "xlc";
echo "<BR><BR><BR>";$Editor->Pages[10]->BackImage[10]->Name = 'str' ;
echo $Editor->Pages[10]->BackImage[10]->Name;
var_dump($Editor);输出内容为:strobject(Editor)#1 (2) { ["Error"]=> string(0) "" ["Pages"]=> array(2) { [0]=> object(Page)#2 (2) { ["Id"]=> string(0) "" ["BackImage"]=> array(1) { [0]=> object(Decorator)#3 (1) { ["Ext"]=> string(0) "" } } } [10]=> object(stdClass)#4 (1) { ["BackImage"]=> array(1) { [10]=> object(stdClass)#5 (1) { ["Name"]=> string(3) "str" } } } } }请查数据Pages[10]的键值,其实他创建的是一人stdClass类页并不是Page类的一个实例,这个应该是php5特性吧。
刚开始以为是魔术方法里面问题,但后来确定了一下,不是的。
$BackImage = array(1,2,3,4);
$this->BackImage[] = new Decorator;
//这里增加两句或者可帮助你理解
print_r($BackImage);
print_r($this->BackImage);
}
你需要了解一下类的属性和类内出现的一般变量的异同建议你应该去学习 类的继承,能理清并简化你上面的思路,减少对象链、方法链的使用