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

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? php.net/manual/en/function.array-sum.php — Funk Forty Niner
– Funk Forty Niner, Commented May 13, 2016 at 16:26
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
– Mark Baker, Commented May 13, 2016 at 16:36
@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
– Mark Baker, Commented May 13, 2016 at 16:41
possible profile duplicates stackoverflow.com/users/6171058/jari-rengeling - stackoverflow.com/users/6171680/kip-verslaafde — Funk Forty Niner
– Funk Forty Niner, Commented May 13, 2016 at 16:41

ScaisEdge · Accepted Answer · 2016-05-13 16:41:29Z

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, 2016 at 16:41

answered May 13, 2016 at 16:28

ScaisEdge

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4 Comments

Tom Wright Over a year ago

He asked for the average of the even numbers, not just the average.

ScaisEdge Over a year ago

by even index or even value?

Tom Wright Over a year ago

By value... "I need to get the average of all the even numbers in this array:"

ScaisEdge Over a year ago

I have update the answer

Webeng · Accepted Answer · 2016-05-13 16:27:07Z

-1

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

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

answered May 13, 2016 at 16:27

Webeng

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