Order array multi-dimensional - php

Question

I have an array that looks like this:
$cars = array (
array(
'a' => 'audi',
'b' => 'a4'),
array(
'a' => 'peugeot',
'b' => '306'),
array(
'a' => 'audi',
'b' => 'a4'),
array(
'a' => 'audi',
'b' => 'a5'),
array(
'a' => 'peugeot',
'b' => '106'),
array(
'a' => 'peugeot',
'b' => '106'),
);
I need to order arrays like this to (id is the same as name):
name => audi
id=> audi
data => a4 => 2
a5 => 1
name => peugeot
id=> peugeot
data => 306 => 1
106 => 2
So the car brands need to be grouped an the car types counted.
I already have this code; but that is only for the group part and the count part is missing.
function mergeAndOrder($data){
// set group arrays
$i = 0; $group1 = array();
// loop trough array
$array = array(); $array2 = array();
if($data != null){
foreach($data AS $row){
// search and order level1
$search = array_search($row->a,$group1);
// this object is not found
if(is_int($search) == false){
$group1[$i] = $row->a;
$array[$i]['id'] = $row->a;
$array[$i]['name'] = $row->a;
$array[$i]['data'] = array();
$i++;
}
}
}
return $array;
}
Does somebody know an solution for this case? Thanks!
--- INPUT (part of) ---
a = lease company in this case
Array
(
[0] => stdClass Object
(
[b] => AUDI
[a] => LPN
)
[1] => stdClass Object
(
[b] => AUDI
[a] => LPN
)
[2] => stdClass Object
(
[b] => AUDI
[a] => LPN
)
[3] => stdClass Object
(
[b] => AUDI
[a] => LPN
)
--- OUTPUT (part of) ---
Array
(
[0] => Array
(
[id] => LPN
[name] => LPN
[data] => Array
(
)
)
[1] => Array
(
[id] => ARV
[name] => ARV
[data] => Array
(
)
)
[2] => Array
(
[id] => ARVB
[name] => ARVB
[data] => Array
(
)
)
[3] => Array
(
[id] => LPD
[name] => LPD
[data] => Array
(
)
)
)
Array
(
[0] => Array
(
[id] => LPN
[name] => LPN
[data] => Array
(
)
)
[1] => Array
(
[id] => ARV
[name] => ARV
[data] => Array
(
)
)
[2] => Array
(
[id] => ARVB
[name] => ARVB
[data] => Array
(
)
)

Answer 1

If I understand your question correctly, this should do what you want.
function mergeAndOrder ($data) {
$output = array();
foreach ($data as $item) {
$id = $item->a;
$value = $item->b;
if (!array_key_exists($id, $output)) {
$output[$id] = array('id' => $id, 'name' => $id, 'data' => array());
}
if (!array_key_exists($value, $output[$id]['data'])) {
$output[$id]['data'][$value] = 0;
}
$output[$id]['data'][$value]++;
}
// Order by name element
uasort($output, function ($a, $b) {
return strcasecmp($a['name'], $b['name']);
});
return $output;
}
Output:
Array
(
[audi] => Array
(
[id] => audi
[name] => audi
[data] => Array
(
[a4] => 2
[a5] => 1
)
)
[peugeot] => Array
(
[id] => peugeot
[name] => peugeot
[data] => Array
(
[306] => 1
[106] => 2
)
)
)