How to iterate an array to count elements PHP? - php

Question

I wanna know how to iterate an array to count elements in PHP, I've trying next,
foreach ($items as $item) {
$tm[$item->provider->name] = [];
foreach ($items as $item) {
$tm[$item->provider->name][$item->product->brand->name] = isset($tm[$item->provider->name][$item->product->brand->name]) ? $tm[$item->provider->name][$item->product->brand->name] + 1 : $tm[$item->provider->name][$item->product->brand->name] = 1;
}
}
But I get a wrong result, I get an array but I get a very high number count as if iterated many timesmany times
The structure of the array is as follows
[{
"id": 1,
"product": {
"id": 1,
"brand": {
"id": 1,
"name": "iphone"
}
},
"provider": {
"id": 1,
"name": "at&t"
}
},
{
"id": 2,
"product": {
"id": 2,
"brand": {
"id": 2,
"name": "iphone"
}
},
"provider": {
"id": 1,
"name": "at&t"
}
},
{
"id": 3,
"product": {
"id": 3,
"brand": {
"id": 3,
"name": "iphone"
}
},
"provider": {
"id": 1,
"name": "t-mobile"
}
}]

Answer 1

IIUC, you are trying to count the product->brand->name values for each provider->name. You can do that using this code:
$tm = array();
foreach ($items as $item) {
$product = $item->product->brand->name;
$provider = $item->provider->name;
$tm[$provider][$product] = ($tm[$provider][$product] ?? 0) + 1;
}
print_r($tm);
Output (for your sample data):
Array
(
[at&t] => Array
(
[iphone] => 2
)
[t-mobile] => Array
(
[iphone] => 1
)
)
Demo on 3v4l.org

Answer 2

From your code example you apparently want to count how many occurrences are for each "thing" in your array, otherwise count() would have probably sufficed...
Though you are doing a lot of work to pre-init the counting array - that is completely unneeded: read about auto-vivifcation.
Code like so would probably suffice (I'm not following your example code here - you'd need to work out to your needs):
$counters = [];
foreach ($items as $item)
#$counters[$item->name][$item->model]++;