how can i get count of each age group using php - php

Question

please check this :
Array
(
[0] => 46-65
[1] => 7-12|31-45
[2] => 31-45
[3] => 31-45
[4] => 66+
[5] => 18-30
[6] => 46-65
[7] => 13-17|46-65
Here i converted string to array then i got below array :
Array
(
[0] => Array
(
[0] => 46-65
)
[1] => Array
(
[0] => 7-12
[1] => 31-45
)
[2] => Array
(
[0] => 31-45
)
[3] => Array
(
[0] => 31-45
)
[4] => Array
(
[0] => 66+
)
[5] => Array
(
[0] => 18-30
)
[6] => Array
(
[0] => 46-65
)
[7] => Array
(
[0] => 13-17
[1] => 46-65
)
[8] => Array
(
[0] => 31-45
)
[9] => Array
(
[0] => 31-45
)
[10] => Array
(
[0] => 31-45
)
[11] => Array
(
[0] => 18-30
)
[12] => Array
(
[0] =>
)
[13] => Array
(
[0] => 46-65
)
[14] => Array
(
[0] => 7-12
[1] => 31-45
)
[15] => Array
(
[0] => 18-30
)
[16] => Array
(
[0] => 18-30
[1] => 31-45
)
[17] => Array
(
[0] => 18-30
)
[18] => Array
(
[0] => 31-45
)
[19] => Array
(
[0] => 18-30
)
[20] => Array
(
[0] => 13-17
[1] => 18-30
[2] => 46-65
)
}
I stored age group in string format because each row can be have multiple age group. after that i converted into array.
How can i get count of each age group like 46-65 is 6 times 18-30 is 8 times.
HEre i want count of each age group

Answer 1

This code should work for that:
<?php
$selections = [/** your array here */];
$counted = [];
// Loop full list
foreach($selections as $selection) {
// Loop age elements in list
foreach ($selection as $age) {
// If not already counted initialise age range
if(!isset($counted[$age])) {
$counted[$age] = 0;
}
// Increment age range
$counted[$age]++;
}
}
var_dump($counted);

Answer 2

I'm not sure I fully understood tom problem. Try something like this.
This will return you a array with as key the groups and as value the number of times it has been met.
I used your second array or you already subdivided into sub array
$groups = [];
foreach($array as $subArray) {
foreach ($subArray as $group) {
if (isset($groups[$group])) {
$groups[$group] += 1;
} else {
$groups[$group] = 1;
}
}
}