foreach迴圈php中的总和

$sum = 0;
foreach($group as $key=>$value)
{
   $sum+= $value;
}
echo $sum;

如果您要使用foreach迴圈，則

$sum = 0;
foreach($group as $key => $value) {
   $sum += $value; 
}
echo $sum;

但是，如果您想使用陣列的直接和，而不是下面的解決方案：

$total = array_sum($group);

對於 only sum of array 迴圈就是浪费時間。

http://php.net/manual/zh/function.array-sum.php

array_sum —計算陣列中值的总和

<?php
$a = array(2, 4, 6, 8);
echo "sum(a) = " . array_sum($a) . "\n";
$b = array("a" => 1.2, "b" => 2.3, "c" => 3.4);
echo "sum(b) = " . array_sum($b) . "\n";
?>

The above example will output:

sum(a) = 20
sum(b) = 6.9

使用 +=

$val = 0;
foreach($arr as $var) {
   $val += $var; 
}
echo $val;

您可以使用 array_sum()

$total = array_sum($group);

$total=0;
foreach($group as $key=>$value)
{
   echo $key. " = " .$value. "<br>"; 
   $total+= $value;
}
echo $total;