Average of even numbers in array with for/while loop PHP

Question

I need to get the average of all the even numbers in this array:

$aReeks = array(23,245,1,2,12,-10,46,6,66,9999,-55,348,56,6,66,983);

Can someone please help me? I'm already trying over an hour.
I have to do it with a for/while loop.

sum up the array then divide by the number in the array; it's simple math. Don't they teach math in school now? http://php.net/manual/en/function.array-sum.php — Funk Forty Niner, May 13 '16 at 16:26
http://stackoverflow.com/questions/32302645/foreach-loop-and-average-in-php — Jose Manuel Abarca Rodríguez, May 13 '16 at 16:26
Must be the same class and due today: http://stackoverflow.com/questions/37212309/getting-total-value-of-an-array-with-condition/37212711#37212711 — AbraCadaver, May 13 '16 at 16:35
Filter out the odd values, and then use sum and divide by the count: `$evens = array_filter($aReeks, function ($value) { return $value % 2 == 0; }); $evenAverage = arry_sum($evens) / count($evens);` — Mark Baker, May 13 '16 at 16:36
@AbraCadaver Huh... well will you look at that! or the same "guy". — Funk Forty Niner, May 13 '16 at 16:37
And let's not forget http://stackoverflow.com/questions/37210893/getting-highest-even-number-out-of-an-array — Mark Baker, May 13 '16 at 16:37
@MarkBaker and no accepted answer nor in any of that guy's questions. I think this is a group troll or he's exchanging points between profiles. — Funk Forty Niner, May 13 '16 at 16:38
possible duplicate of [Getting highest even number out of an array](http://stackoverflow.com/questions/37210893/getting-highest-even-number-out-of-an-array) — Funk Forty Niner, May 13 '16 at 16:40
possible duplicate of [Getting total value of an array with condition](http://stackoverflow.com/questions/37212309/getting-total-value-of-an-array-with-condition) — Funk Forty Niner, May 13 '16 at 16:40
@Fred-ii- I still like my answer to that one using the proposed 7.1 piped syntax.... hope one of them submits that as their homework — Mark Baker, May 13 '16 at 16:41
possible profile duplicates http://stackoverflow.com/users/6171058/jari-rengeling - http://stackoverflow.com/users/6171680/kip-verslaafde — Funk Forty Niner, May 13 '16 at 16:41

ScaisEdge · Answer 1 · 2016-05-13T16:41:29.630

2

Use array_sum() and count()

$aReeks = array(23,245,1,2,12,-10,46,6,66,9999,-55,348,56,6,66,983); 

 echo array_sum($Reeks) /count($aReeks);

you can get the array with only the even number this way

 foreach($aReeks as $key => $value) if($key&1) unset($aReeks[$key]);

and then

  echo array_sum($Reeks) /count($aReeks);

edited May 13 '16 at 16:41

answered May 13 '16 at 16:28

ScaisEdge

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He asked for the average of the even numbers, not just the average. – Tom Wright May 13 '16 at 16:33
by even index or even value? – ScaisEdge May 13 '16 at 16:38
By value... "I need to get the average of all the even numbers in this array:" – Tom Wright May 13 '16 at 16:39
I have update the answer – ScaisEdge May 13 '16 at 16:41

score -1 · Answer 2 · answered May 13 '16 at 16:27

-1

$count = 0;
$average = 0;
foreach ($aReeks as $value)
{
  $count++;
  $average += $value;
}
$average = $average/$count;

echo "average: {$average}<br>";

answered May 13 '16 at 16:27

Webeng

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Average of even numbers in array with for/while loop PHP

2 Answers2