How to calculate the average of an array in PHP?

Question

So I am in this array code

$numers = array
(
  array(198,208,109,11,636),
  array(198,188,84,55,756),
  array(194,206,113,13,531),
  array(184,213,127,18,101),
  array(194,213,127,23,110),
  array(984,213,127,44,125),
  array(184,213,127,88,980),
  array(995,211,129,63,888)
);

Now I want to calculate the column average of the second column (208, 188, 206, 213, 213, 213, 213, 211) (from the first 198, 198, 194, 184, 194, 984, 184, 995) and so on until the fifth to last column.

I don't know how to do this, so can someone explain to me how to calculate the column average for each column.

Answer 1

<?php

$numers = array(
  array(198,208,109,11,636),
  array(198,188,84,55,756),
  array(194,206,113,13,531),
  array(184,213,127,18,101),
  array(194,213,127,23,110),
  array(984,213,127,44,125),
  array(184,213,127,88,980),
  array(995,211,129,63,888)
);

$num_cols = count($numers[0]);

for ($i = 0; $i < $num_cols; $i++) {
  $column = array_column($numers, $i); 
  $average = array_sum($column) / count($column);
  echo "Column $i average: $average<br>";
}

Output:

Column 0 average: 391.375
Column 1 average: 208.125
Column 2 average: 117.875
Column 3 average: 39.375
Column 4 average: 515.875