Finding average of same key values of an associate array - php

Question

I've have an array such as
//$ary, $ary contains some 80 entries, I'm showing only the first 10
Array
(
[0] => Array
(
[December 2012] => 58
)
[1] => Array
(
[November 2012] => 84
)
[2] => Array
(
[December 2012] => 83
)
[3] => Array
(
[November 2012] => 72
)
[4] => Array
(
[November 2012] => 47
)
[5] => Array
(
[December 2012] => 93
)
[6] => Array
(
[November 2012] => 79
)
[7] => Array
(
[October 2012] => 70
)
[8] => Array
(
[November 2012] => 75
)
[9] => Array
(
[October 2012] => 59
)
[10] => Array
(
[December 2012] => 67
)
)
I'm able to get the total for each month using:
foreach($ary as $array)
{
foreach($array as $month=>$cent)
{
if(isset($abc[$month])) // prevent index warning
{
$abc[$month] += $cent;
// tried using $abc[$month] = $abc[$month]/2 but wrong values were returned
}
else
{
$abc[$month] = $cent;
}
}
}
This is resulting in
Array
(
[December 2012] => 2195
[November 2012] => 2159
[October 2012] => 1631
)
But I'm unable to find a way to find the average value for each month. In my case, there are 31 instances of December 2012, 31 instances of November 2012 and 25 instances of October 2012. Thus, I need to get hold of these 31, 31, and 25 values so that I can divide a month by that number.
I'm thinking something must be done inside if(isset($abc[$month])) loop to capture but haven't been successful so far. Is there any other way to get the average?
PS : I can't hardcode the month's name (October, November, December) for comparison purposes. They keep changing at regular intervals.

Answer 1

$eachMonth = array();
foreach($ary as $array)
{
foreach($array as $month=>$cent)
{
$eachMonth[$month][] = $cent;
if(isset($abc[$month])) // prevent index warning
{
$abc[$month] += $cent
}
else
{
$abc[$month] = $cent;
}
}
}
then for each month you can calculate average:
foreach( $eachMonth as $month => $values)
{
echo $month.' : '.$abc[$month] / count($values);
}

Answer 2

try this :
$your_array = array(array("December 2012" => 58),
array("December 2012" => 58)
);
$res = array();
foreach($your_array as $val){
$res[key($val)][] = $val[key($val)];
}
foreach($res as $k=>&$v){
$v = array_sum($v)/count($v);
}
echo "<pre>";
print_r($res);