a sum of some values in an php array [closed] - php

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I have this array`
<?php
$arr = [['name'=>'john','age'=>20,'sex'=>'m'],
['name'=>'maria','age'=>12,'sex'=>'f'],
['name'=>'nick','age'=>25,'sex'=>'m'],
['name'=>'jo','age'=>31,'sex'=>'f'],];
foreach ($arr as $persoana) {
foreach ($persoana as $id=>$value) {
if ($id == 'age') {
$sumvarsta = $sumvarsta + $value;
$n++;
}
}
}`?>
i need total average age (total average age seems to be working ok) , average age for women and average age for men.
How to calculate ?
thx.

Answer 1

<?php
$arr = [['name'=>'john','age'=>20,'sex'=>'m'],
['name'=>'maria','age'=>12,'sex'=>'f'],
['name'=>'nick','age'=>25,'sex'=>'m'],
['name'=>'jo','age'=>31,'sex'=>'f'],];
$womansum = 0;
$womancount = 0;
$mansum = 0;
$mancount = 0;
foreach ($arr as $persoana) {
if ($persoana['sex'] == 'm')
{
$mansum += $persoana['age'];
$mancount++;
} else {
$womansum += $persoana['age'];
$womancount++;
}
}
$manAverage = $mansum / $mancount;
$womanAverage = $womansum / $womancount;
$totalAverage = ($mansum + $womansum) / ($mancount + $womancount);
?>