Select only elements you want in string/array

Question

I have an array like this $arr = array(2, -3, 6, 1);

And I only want to select the positive numbers to be able to sum the others between them.

So I wrote this code, but I'm a bit lost on how to select the elements I only want to do something with them, like summing them.

$sum = implode(",", $arr);

  for($i = 0; $i <= strlen($sum); $i++) {
    if($i <= 0) {
    } else {
      return explode(",", array_sum($i));
  }
 }
}

use array_filter, no need to use an explicit loop: php.net/manual/en/function.array-filter.php — Casimir et Hippolyte
– Casimir et Hippolyte, Commented Jan 13, 2017 at 15:12
@GrumpyCrouton I edited the title. Sorry about that, I just want to be able to select only element I want in the array. And sum the others together. — chicken burger
– chicken burger, Commented Jan 13, 2017 at 15:16

LF-DevJourney · Accepted Answer · 2017-01-13 15:51:01Z

4

Use array_fliter to filter the value, and array_sum to sum the array.

   array_sum(array_filter($array, function($v){return $v>0;});

edited Jan 13, 2017 at 15:51

answered Jan 13, 2017 at 15:14

LF-DevJourney

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1 Comment

chicken burger Over a year ago

Thank you for your answer. But I can't figure out how does that works. I have $arr = array(2, -3, 6, 1);

lazyCoder · Accepted Answer · 2017-01-13 15:21:06Z

0

Use array_filter with callback function like below :

<?php
    $arr = array(2, -3, 6, 1);
    function positive($a){
        if($a > 0){
            return $a;
        }

    }
    $newArr = array_sum(array_filter($arr, "positive"));
    print_r($newArr);
?>

answered Jan 13, 2017 at 15:21

lazyCoder

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Comments

Casimir et Hippolyte · Accepted Answer · 2017-01-13 15:56:09Z

0

Using array_reduce:

$arr = array(2, -3, 6, 1);

$result = array_reduce($arr, function($c, $i) { return $i > 0 ? $c + $i : $c; });

echo $result;

answered Jan 13, 2017 at 15:56

Casimir et Hippolyte

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