ecshop 制作捆绑销售之排列组合算法

//jimpei's code 排列组合

function get_goods_specifications_combine($goods_id)
{
    if (empty($goods_id))
    {
        return array();  //$goods_id不能为空
    }

    $sql = "SELECT g.goods_attr_id, g.attr_value, g.attr_id, a.attr_name
            FROM " . $GLOBALS['ecs']->table('goods_attr') . " AS g
                LEFT JOIN " . $GLOBALS['ecs']->table('attribute') . " AS a
                    ON a.attr_id = g.attr_id
            WHERE goods_id = '$goods_id'
            AND a.attr_type = 1
            ORDER BY g.attr_id ASC";
    $results = $GLOBALS['db']->getAll($sql);
	$pre_attr_id=$results[0]['attr_id'];
	$property_list=array();
	for($j=0;$j $Value){
		$CombineCount *= count($Value);
	}
	$RepeatTime = $CombineCount;
	foreach($CombinList as $ClassNo => $StudentList){
		$RepeatTime = $RepeatTime/count($StudentList);
		$StartPosition = 1;
		foreach($StudentList as $Student){
			$TempStartPosition = $StartPosition;
			$SpaceCount = $CombineCount/count($StudentList)/$RepeatTime;
			for($J = 1; $J <= $SpaceCount; $J ++){
				for($I = 0; $I < $RepeatTime; $I ++){
					$Result[$TempStartPosition + $I][$ClassNo] = $Student;
				}
				$TempStartPosition += $RepeatTime * count($StudentList);
			}
			$StartPosition += $RepeatTime;
		}
	}
	return $Result;
}