sum of the integer in nested array in php

Question

    <?php
    $r1=array("n"=>3,"ni"=>2,["nis"=>3,[["nish"=>4],[["nishi"=>"n"],[["nishi"=>true]]]]]);
    echo "<pre>";
    //print_r($r1);
    echo "</pre>";
    $sum=0;

    for ($i=0;$i<count($r1);$i++) {
    $curr=$r1[$i];
    if (is_array($curr)) {
                $sum += array_sum($curr);
            } else if (is_numeric($curr)) {
                $sum += $curr;
            }
            echo $sum;
    }
?>

i am trying to find the the sum of the values in the array and leave the string . if anyone knows the answer plz help

so plz help , I am new to array ....i have little knowledge in array and how the recursion work — PHP_USER1
– PHP_USER1, Commented Oct 10, 2013 at 7:07

Glavić · Accepted Answer · 2013-10-10 08:41:29Z

1

Use array_walk_recursive to walk over each element of the array:

$sum = 0;
array_walk_recursive($r1, function($v) use (&$sum) {
    if (is_numeric($v)) $sum += $v;
});
var_dump($sum); # 12

Edit: Use without array_walk_recursive function:

function array_walk_recursive_rewrite(array $data) {
    $sum = 0;
    foreach ($data as $v) {
        if (is_array($v)) {
            $sum += array_walk_recursive_rewrite($v);
        } elseif (is_integer($v)) {
            $sum += $v;
        }
    }
    return $sum;
}
var_dump( array_walk_recursive_rewrite($r1) ); # 12

edited Oct 10, 2013 at 8:41

answered Oct 10, 2013 at 7:06

Glavić

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8 Comments

PHP_USER1 Over a year ago

function($v) use (&$sum) please can u explain me this step ?

PHP_USER1 Over a year ago

is it possible to use the whole code without this function($v) use (&$sum) . instead of this can v use anything else coz i have never used this

PHP_USER1 Over a year ago

Is there any way to do this without using array_walk_recursive

Glavić Over a year ago

There is, make custom function, that does exactly what array_walk_recursive does. But why? Reason that you haven't used this before is just ridiculous.

PHP_USER1 Over a year ago

no no this is not the reason , i want to try without function ......you can see my 1st attempt .......I m trying with for loop .......but thanks for the info about array_walk_recursive

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