PHP array_sum - why array_sum is not working for the following script?

Question

I have seen read other posts that are almost similar to my problem. but I can't find the right answer to my problem. here I have a $data[4] array that is like the following.

Array ( [0] => 0.84 ) Array ( [0] => 2.79 ) 

and this my php code for calculating the value in variable $data[4]

$a= array();
foreach(array($data[4]) as $datas) {
    $a[] = $datas;
}
 print_r($a); 

 $sum = array_sum($a);
 echo $sum;

}

but the results are not calculating, instead of displaying values ​​from the data array $data[4] like this

0.84
2.79

Answer 1

You got two arrays with 0 index in $data[4]. You have to flatten this $a, you can add extra foreach.

$a= array();
foreach(array($data[4]) as $datas) {
    foreach($datas as $item) { // here - extra foreach
        $a[] = $item;
    }
}
 print_r($a); 

 $sum = array_sum($a);
 echo $sum;

}

By the way - consider using var_export to show more precisely what's in your data :)

Answer 2

Assume that your array is like $data[4] = [[0.89],[2.79]] then you can use this code to get sum.

$sum = 0;
foreach($data[4] as $datas) {
    $sum +=  array_sum($datas);
}
echo $sum;