作用循环读取某栏目下的所有子栏目。

<?php
//网站导航栏目id
class navigation
{
	var $class;
	var $classstr = "";
	
	function __construct($id)
	{
		$this->class = $id;
	}
	
	function ishave($id)
	{
		global $myobj,$language;
		$sql = "select * from cy_{$language}_sitecategory where did = ".$id;
		$result = $myobj->getRowsRst($sql);
		return $result;
	}
	
	function subclass($id)
	{
		global $myobj,$language;
		$sql = "select * from cy_{$language}_sitecategory where did = ".$id;
		$rs = $myobj->query($sql);
		while($rt = $myobj->getarray($rs))
		{
			$classstr .= $rt['id'].', ';
		}
		return $classstr;
	}	
	
	function classname()
	{
		global $myobj,$language;
		$tmpstr = "";
		$sql = "select * from cy_{$language}_sitecategory where did = ".$this->class;
		$rs = $myobj->query($sql);
		while($rt = $myobj->getarray($rs))
		{
			if($this->ishave($rt['id']))
			{
				$tmpstr = $this->subclass($rt['id']);
			}
			$classstr .= $rt['id'].', ';
		}
		return empty($tmpstr)?$classstr:$classstr.$tmpstr;
	}
	
}


?>