Php 联合双foreach循环

我有一个产品表和一个订单表，我想结合这些数据来绘制条形图。如果我运行每个循环的订单，产品将不显示，如果我运行产品，则订单将不显示。如何结合这些

$query_product = "SELECT *,count(products.id) as no_products FROM products group by MONTH(products.added_on) , YEAR(products.added_on)";

$query_order = "SELECT *,count(orders.id) as no_orders FROM orders group by MONTH(orders.added_on) , YEAR(orders.added_on)  order by YEAR(orders.added_on) asc, MONTH(orders.added_on) asc";

$result_order = mysqli_query($con, $query_order);
$result_product = mysqli_query($con, $query_product);
$chart_data = '';

$product_data = array();

while ($row = mysqli_fetch_assoc($result_product)) {
    $product_data[] = $row;
}

$order_data = array();

while ($row = mysqli_fetch_assoc($result_order)) {
    $order_data[] = $row;
}

foreach ($order_data as $key => $val) {
    $date = $val['added_on'];

    $month_year = date('F, Y', strtotime($date));

    $chart_data .= "{ year:'" . $month_year . "', income:" . '5' . ", products:" . '' . ", orders:" . $val['no_orders'] . "}, ";
}

//I want to gain my data like this below string.

 //$chart_data .= "{ year:'".$month_year."', income:".'5'.", products:".$val['no_products'].", orders:".$val['no_orders']."}, ";

}

---

可能是这样的—使用关联数组来存储数据，因为您是按月/年对数据进行分组的

while ($row = mysqli_fetch_assoc($result_product)) {
    $product_data[date("m-Y", strtotime($row['added_on']))] = $row;
}


while ($row = mysqli_fetch_assoc($result_order)) {
    $order_data[date("m-Y", strtotime($row['added_on']))] = $row;
}

现在，您可以引用阵列：

foreach ($order_data as $key => $val) {
    $date = $val['added_on'];

    $month_year = date('F, Y', strtotime($date));
    $keyFind = date("m-Y", strtotime($date));

    $chart_data[]= array(
        "year" => $month_year, 
        "income" => '5', 
        "products" => $product_data[$keyFind]['no_products'],
        "orders" => $val['no_orders']
     );
   }

   // NOW make it json
   $chart_data = json_encode($chart_dta);

---

请分享更多细节。你所说的“如何组合这些”是什么意思？结果应该是怎样的？你还试图解决什么问题？为什么你要自己构建json字符串，而不是使用数组和

json_encode

？嗨，我想显示我的数据，比如$chart_data.=“{year:”“$month_year.”，收入：“.5.”，产品：“.val['no_products']”，订单：“.val['no_orders']”，”；如果我使用double foreach循环，那么我将无法得到我需要的结果，我希望如果我添加产品，那么数据将仅显示产品，如果我下订单，那么数据将显示我每个月的订单和产品，我希望您理解。请通过编辑对您的问题进行所有澄清。再说一次：为什么不使用

json\u encode

？我是初学者，我不知道json\u encode，我正在努力学习，这就是为什么我使用数组和循环