If you want to calculate the sum in multi-dimensional arrays:
<?php
function array_multisum(array $arr): float {
$sum = array_sum($arr);
foreach($arr as $child) {
$sum += is_array($child) ? array_multisum($child) : 0;
}
return $sum;
}
?>
Example:
<?php
$data =
[
'a' => 5,
'b' =>
[
'c' => 7,
'd' => 3
],
'e' => 4,
'f' =>
[
'g' => 6,
'h' =>
[
'i' => 1,
'j' => 2
]
]
];
echo array_multisum($data);
//output: 28
?>
array_sum
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
array_sum — 배열 값들의 합을 계산
인수
-
array -
입력 배열.
반환값
값들의 합을 정수나 소수로 반환합니다.
변경점
| 버전 | 설명 |
|---|---|
| 4.2.1 | PHP 4.2.1 이전 버전에서는 전달되는 배열 자체를 변경해서 문자열을 숫자로 변경했었다. (그 값에 따라 대부분 0으로 변환된다) |
예제
Example #1 array_sum() 예제
<?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";
?>
위 예제의 출력:
sum(a) = 20 sum(b) = 6.9
add a note
User Contributed Notes 6 notes
rodrigo at adboosters dot com ¶
2 years ago
harl at gmail dot com ¶
1 year ago
array_sum() doesn't "ignore strings if they are not convertible", it converts them to zero. array_product() does the same thing, where the difference between "ignoring" and "converting to zero" is much more obvious.
Michele Marsching ¶
1 year ago
Notably the function converts strings to float and ignores strings if they are not convertable:
<?php
$a = array("String", 2, 4, 6, 8);
echo "sum(a) = " . array_sum($a) . "\n";
$b = array("12.3456", 2, 4, 6, 8);
echo "sum(b) = " . array_sum($b) . "\n";
?>
sum(a) = 20
sum(b) = 32.3456
samiulmomin191139 at gmail dot com ¶
2 years ago
<?php
//you can also sum multidimentional arrays like this;
function arraymultisum(array $arr){
$sum=null;
foreach($arr as $child){
$sum+=is_array($child) ? arraymultisum($child):$child;
}
return $sum;
}
echo arraymultisum(array(1,4,5,[1,5,8,[4,5,7]]));
//Answer Will be
//40
?>
sarosekvlad12 at gmail dot com ¶
1 year ago
If you have a case where your array has int in strings, it sums them up as if there were only int in the array!
function sum_mix($a)
{
return array_sum($a);
}
var_dump(sum_mix([9, 3, '7', '3']));
Response will be int(22)
yakushabb at gmail dot com ¶
2 years ago
array_sum converts strings to integer and array_sum(2,'2') returns 4.
I had no idea.
