(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
array_sum — Calculate the sum of values in an array
arrayThe input array.
Returns the sum of values as an integer or float; 0 if the
array is empty.
| Version | Description |
|---|---|
| 8.3.0 |
Now emits E_WARNING when array values
cannot be converted to int or float .
Previously array s and object s where ignored whilst every other value was cast to int .
Moreover, objects that define a numeric cast (e.g. GMP ) are now cast instead of ignored.
|
Example #1 array_sum() examples
<?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
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() 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.