// 定義資料陣列
$page1data1 = array('k', 1); 
$page1data2 = array('pt', 2); 
$page1data3 = array('k', 3); 
$page1data4 = array('k', 4); 
$page1data5 = array('pt', 5); 
$page1 = array($page1data1,$page1data2,$page1data3,$page1data4,$page1data5);
$page2data1 = array('k', 0.1); 
$page2data2 = array('pt', 0.2); 
$page2data3 = array('k', 0.3); 
$page2data4 = array('k', 0.4); 
$page2data5 = array('pt', 0.5); 
$page2 = array($page2data1,$page2data2,$page2data3,$page2data4,$page2data5);
$db = array($page1, $page2);
 
$pages_count = count($db);
$data_count = count($db[1][1]);
 
// 建立一個關聯陣列來存放相同分類的重量總和
$sum_same_category_weight = array();
 
// 開始計算
for($i = 0; i < $pages_count; i++){
	for($j = 0; j < $data_count; j++){
		// 取得分類和重量
    	$category = $db[i][j][0];
    	$weight = $db[i][j][1];
 
    	// 如果這個種類還沒有出現過，則初始化總和為 0
    	if (!isset($sum_same_category_weight[$category])) {
    	 $sum_same_category_weight[$category] = 0;
		}
 
    	// 將第二項資料加到對應的種類總和中
    	$sum_same_category_weight[$category] += $weight;
		}
}
 
// 輸出每個種類的總和
foreach ($sum_same_category_weight as $category => $sum) {
    echo "種類 {$category} 的總和為: {$sum}\n";
}

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