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array_sum

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

array_sum — 对数组中所有值求和

说明

array_sum(array $array): int|float

array_sum() 将数组中的所有值相加，并返回结果。

参数

array: 输入的数组。

返回值

所有值的和以整数或浮点数的结果返回，array 为空时则返回 0。

示例

示例 #1 array_sum() 例子

<?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";
?>

以上示例会输出：

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

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User Contributed Notes 6 notes

down

rodrigo at adboosters dot com ¶

1 year ago

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
?>

down

Michele Marsching ¶

10 months 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

down

-1

sarosekvlad12 at gmail dot com ¶

5 months 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)

down

-3

harl at gmail dot com ¶

10 months 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.

down

-9

samiulmomin191139 at gmail dot com ¶

1 year 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

?>

down

-17

yakushabb at gmail dot com ¶

1 year ago

array_sum converts strings to integer and array_sum(2,'2') returns 4.

I had no idea.

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