How to count specific key values from a multi-dimensional array? - php

Question

I have a vendor data array listed as a tree structure and each vendor have a type.
These are types of vendor and its id:
Agency = 1
Branch Agency = 2
Wholsaler = 3
Smartshop = 4
Example: ['type']=>2 (here this vendor is a branch agency).
My question is: How can I get the count of Branch agencies are in this array, same count of wholesaler and smart shop?
Desired result:
[2 => 2, 3 => 2, 4 => 1]
Here is my dynamic generated array:
Array
(
[2] => Array
(
[id] => 2
[type] => 2
[name] => R-1 Agency
[parent] => 1
[children] => Array
(
[3] => Array
(
[id] => 3
[type] => 3
[name] => R-1-W-1
[parent] => 2
[children] => Array
(
[11] => Array
(
[id] => 11
[type] => 4
[name] => mdf,lk
[parent] => 3
[children] => Array
(
)
)
)
)
)
)
[38] => Array
(
[id] => 38
[type] => 2
[name] => sndflk
[parent] => 1
[children] => Array
(
[40] => Array
(
[id] => 40
[type] => 3
[name] => new one
[parent] => 38
[children] => Array
(
)
)
)
)
)
I used this function :
function take_types($array){
foreach ($array as $key => $value) {
$types[] = $value['type'];
if(!empty($value['children'])){
$this->take_types($value['children']);
}
}
return $types;
}
When I use the above function the output is like this:
Array
(
[0] => 2
[1] => 2
)
I only get two values, I need to get the count of each vendor type.

Answer 1

There will be many techniques to recursively process your tree data. I'll offer a native function style and a custom recursive style.
array_walk_recursive() visits all of the "leaf nodes", so you only need to check the key and push the value into a variable which can be accessed outside of that function's scope -- this is why "modifying by reference" is vital.
Code: (Demo)
// I removed the chunky $tree declaration from my post, see the demo
$result = [];
array_walk_recursive(
$tree,
function($v, $k) use (&$result) {
if ($k === 'type') {
$result[] = $v;
}
}
);
var_export(array_count_values($result));
Or
function recursiveTypeCount($array, $output = []) {
foreach($array as $item) {
if (!isset($output[$item['type']])) {
$output[$item['type']] = 1;
} else {
++$output[$item['type']];
}
if ($item['children']) {
$output = recursiveTypeCount($item['children'], $output);
}
}
return $output;
}
var_export(recursiveTypeCount($tree));
Both will display:
array (
2 => 2,
3 => 2,
4 => 1,
)