我有一个使用 MYSQL 和 PHP 创建 OODB 的类项目。
目前我的桌子上装满了对象框。我还有一个盒子类,当它被构造时,它会从表中提取数据,然后以类似的方式递归地构造它的子类。这似乎运作良好。但我无法从子框中调用函数。
这是课程:
class Box1 {
var $id;
var $pid;
var $children;
var $type;
var $content;
var $siblingorder;
function Box1($bId){
$q ="SELECT * FROM `box` WHERE id =". $bId;
$r = mysql_query($q);
if ($r){
$row = mysql_fetch_array($r);
$this->id=$bId;
$this->pid=$row[1];
$this->children=$row[2];
$this->type=$row[3];
$this->siblingorder=$row[5];
$this->content=$row[6];
//echo $this->id."<br />";
if(isset($this->children)){
//echo $this->children."<br />";
$kids = explode(',', $this->children);
foreach ($kids as $key => $value) {
$varname = "box".$value;
//global $$varname;
//echo $varname."<br>";
$$varname = new Box1($value);
}
}
}
}//constructor
function display(){
echo "<div style='border: solid 2px;'>";
echo $this->id;
echo "<br />";
if(isset($this->children)){
$kids = explode(',', $this->children);
foreach ($kids as $key => $value) {
$varname = "box".$value;
//echo $varname."<br />";
$$varname->display();
}
}
echo "</div>";
}//End DISPLAY
function update(){
}//End UPDATE
}
下面是调用构造函数和显示函数的代码,而显示函数又应该调用子框显示函数:
$box1 = new Box1(1);
$box1->display();
任何帮助或见解将不胜感激。