如何解决foreach 数组 PHP 中列的总和不起作用
我已经创建了 foreach 函数,并在该函数内部尝试计算列的总和。
我已经阅读了 StackOverflow 或 google 上的所有相关主题,但是我尝试了 3 天,但无法得到答案并解决了我的问题。
请帮助我,我如何计算列,我想对所有 [cost]
求和并显示在 [total]
中。
请帮帮我。
table = table1
ID | key | p_name
---------------------
1 | 123456 | A
2 | 145236 | B
table = table2
ID | column | key
---------------------
1 | 10 | 123456
2 | 5 | 123456
3 | 20 | 145236
4 | 30 | 145236
$stmt = $con->prepare("SELECT * FROM `table1`");
$stmt->execute();
$result = $stmt->fetchAll();
$final = [];
foreach ($result as $data => $value) {
$stmt01 = $con->prepare("SELECT * FROM `table1`");
$stmt01->execute();
if($stmt01->rowCount() > 0) {
while($result001 = $stmt01->fetch(PDO::FETCH_ASSOC)) {
$name = $result001['p_name'];
$sql = $con->prepare("SELECT `ID`,SUM(`column`) AS `last_cost_rate`,`key` FROM `table2` WHERE `key` = :key AND `ID` = (SELECT MAX(`ID`) FROM `table2` WHERE `key` = :key)");
$sql->execute(array(':key' => $value['key']));
$sum = 0;
while($sqlvalue001 = $sql->fetch(PDO::FETCH_ASSOC)) {
$last_costing = $sqlvalue001['last_cost_rate'];
$sum+=$last_costing
}
}
}
$final[] = [
'name' => $name,'total' => $sum
];
}
Array
(
[0] => Array
(
[product] => A
[total] => 5
)
[1] => Array
(
[product] => B
[total] => 30
)
)
解决方法
构建数组后,只需使用 foreach 块替换所有 sumtotal :
因此您可以继续使用以下内容:
$sum += $last_costing;
然后使用以下 foreach 来填充数据:
foreach ($final as &$value) {
$value['sumtotal'] = $sum;
}
所以,代码(完全工作)是:
<?php
// Note: put your real username/password in the following line :
$conn = new mysqli("localhost","user","password","dbname");
$sql="select table1.p_name,table1.`key`,table2.`column` from table1,table2 where table1.`key`=table2.`key` order by table1.id,table2.id desc";
$final = [];
$sum=0;
$stmt = $conn->prepare($sql);
$stmt->execute();
$result = $stmt->get_result();
$opname="";
while ($c = $result->fetch_assoc()) {
if ($opname!=$c["p_name"]) {
$opname=$c["p_name"];
$last_costing=$c["column"];
$sum += $last_costing;
$final[] = [
'product' => $c["p_name"],'total' => $c["column"],'sumtotal' => 0
];
}
}
foreach ($final as &$value) {
$value['sumtotal'] = $sum;
}
print_r($final);
?>
结果是:
Array
(
[0] => Array
(
[product] => A
[total] => 5
[sumtotal] => 35
)
[1] => Array
(
[product] => B
[total] => 30
[sumtotal] => 35
)
)
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