php中数据库中数值求和,php求和代码

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在php中怎样将数据库中文本型数据求和

可以直接使用mysql的sum函数求和,mysql会自动转换为数字型进行求和.

相关问答

Q1: php查询mysql的数值结果怎么相加？

select sum("金额字段") as cmoney from 表 where 1;

然后你输出cmoney这个就是相加的效果。

还有一种比较差点的方法就是：

1、select 金额字段 from 表 where 1;

2、获取你得到的所有信息，然后foreach 把所有的金额相加就行，

实例：$sql = "select money from cg_money where 1";

$query = mysql_query($sql);

$m = 0;

while($rs = mysql_fetch_array($sql)){

$m = $m+$rs['money'];

}

echo $m;这个也是可以获取所有的money的，就是费事了点，还是上面的呢个方法好滴，也就是楼上的呢个方法

Q2: php与mysql表中如何求递归求和汇总?

function sumShuzi($tree, $updateData = array()) {

$sum = 0;

// foreach($tree as $key = $item) { //这句话有毒

foreach($tree as $key = $item) {

if(isset($item['children'])) {

$oldPshuzi = $tree[$key]['Pshuzi'];

$tree[$key]['Pshuzi'] = sumShuzi($item['children'], $updateData);

if($oldPshuzi != $tree[$key]['Pshuzi']) {

$updateData[$item['id']] = array($tree[$key]['Pshuzi'], $tree[$key]['Pname_ch']);

}

$sum += $tree[$key]['Pshuzi'];

}

return $sum;

}

$tree = json_decode('[{"id":"1","Pid":"0","Pname_ch":"\u6e20\u9053\u90e8","Pshuzi":"1638000","children":[{"id":"4","Pid":"1","Pname_ch":"\u9500\u552e\u4e8c\u90e8","Pshuzi":"895000","children":[{"id":"13","Pid":"4","Pname_ch":"\u5468\u7ecf\u7406","Pshuzi":"28","children":[{"id":"28","Pid":"13","Pname_ch":"\u6e56\u5357","Pshuzi":"158000"},{"id":"35","Pid":"13","Pname_ch":"\u65b0\u7586","Pshuzi":"19000"}]},{"id":"40","Pid":"4","Pname_ch":"\u9648\u7ecf\u7406","Pshuzi":"5000"}]}]}]', true);

//$tree是具有父子关系的数据树

sumShuzi($tree, $updateData);

foreach ($updateData as $id = $item) {

$sql = "update your_table set Pshuzi={$item[0]} where id={$id}";

mysqli_query($db, $sql); //$db是你的数据库连接结果

}

Q3: php数组值如何正确相加

//摘自php5手册

?php

$a = array(2, 4, 6, 8);

echo "sum(a) = " . array_sum($a) . "\n";

$b = array("a" = 1.2, "b" = 2.3, "c" = 3.4);