有一个问题:
提交表单后,我收到索引数组作为SQL查询结果,目标是将每个下一个数组值与先前接收到的数组的值相加,并将总和放入结果数组
示例:
// 1st query result
$product_amount = [0 => 0.36,
1 => 0.14,
2 => 0.42]
// 2nd query result
$product_amount = [0 => 0.28,
1 => 0.12,
2 => 0.40]
// n-th query result
$product_amount = [0 => 0.16,
1 => 0.14,
2 => 0.42]
// the sum
$total = [0 => 0.80,
1 => 0.40,
2 => 1.24]
怎么做?
创建数组的代码:
function doseCount($num){
return ($num/100) * intval($_POST['portion']); //getting multiplier for productAmount() function
}
function productAmount(){
global $link; //connection to the MySQL server
if(isset($_POST['product'])){
$product_amount_query = 'SELECT va.vitamin_a, va.vitamin_b1, va.vitamin_b2, va.vitamin_b3, va.vitamin_b5,
va.vitamin_b6, va.vitamin_bc_b9, va.vitamin_b12, va.vitamin_c, va.vitamin_d, va.vitamin_e, va.biotin, va.vitamin_k,
va.flavonoids, va.lipoic_acid FROM products_list p, vitamins_amount va WHERE p.id = va.product_id AND p.name = ?';
$product_amount_stmt = mysqli_prepare($link, $product_amount_query);
mysqli_stmt_bind_param($product_amount_stmt, "s", $_POST['product']);
mysqli_stmt_execute($product_amount_stmt);
$result = mysqli_stmt_get_result($product_amount_stmt);
$product = mysqli_fetch_array($result, MYSQLI_NUM);
return $product_final_result = array_map('doseCount', $product);
mysqli_stmt_close($product_amount_stmt);
mysqli_close($link);
}
}
$product_amount = productAmount();
提交$ product_amount数组后获取新数据,此新值必须与之前的数字相加。
答案 0 :(得分:0)
您可以通过合并array_map和array_sum来实现此目的。如果您使用的是PHP 5.6或更高版本,那么您可以编写如下内容:
$total = array_map(function (...$vals) {
return array_sum($vals);
}, ...$results);
假设$results
包含所有$product_amount
数组。
如果您想逐步构建$total
而不是一次传递所有查询结果,则可以执行以下操作:
// Initialize $total array
$total = [0, 0, 0];
// Update $total for each query
$total = array_map(function (...$vals) {
return array_sum($vals);
}, $total, $product_amount);
答案 1 :(得分:0)
通过正确使用会话可以解决这个问题:
if (empty($_SESSION['product_amount'])){
$_SESSION['product_amount'] = $product_amount;
}else{
foreach ($_SESSION['product_amount'] as $key => $value) {
$_SESSION['product_amount'][$key] += $product_amount[$key];
}
}
特别感谢Mawia HL的帮助。