How to give names to arrays inside RecursiveArrayIterator? - php

Question

Originally, I manually created nested foreach loops:
$first_array_counter = 0;
$second_array_counter = 0;
$third_array_counter= 0;
$fourth_array_counter = 0;
foreach ($nested_array_4_layers as $layer1_items) {
$first_array['first_array_id'] = $first_array_counter;
foreach ($layer1_items as $layer2_items) {
$second_array['second_array_id'] = $second_array_counter;
foreach ($layer2_items as $layer3_items) {
$third_array['third_array_id'] = $third_array_counter;
foreach ($layer3_items as $layer3_items) {
$fourth_array['fourth_array_id'] = $fourth_array_counter;
$fourth_array_counter++;
}
$third_array_counter++;
}
$second_array_counter++
}
$first_array_counter++;
}
But now I'm trying to change the code to be dynamic and with varying nesting levels. For example with 3 nesting levels and different names:
foreach ($nested_array_3_layers as $layer1_items) {
$other_first_array['first_array_id'] = $first_array_counter;
foreach ($layer1_items as $layer2_items) {
$other_second_array['second_array_id'] = $second_array_counter;
foreach ($layer2_items as $layer3_items) {
$other_third_array['third_array_id'] = $third_array_counter;
$third_array_counter++;
}
$second_array_counter++
}
$first_array_counter++;
}
For that I changed the code to use RecursiveIteratorIterator with RecursiveArrayIterator:
$iter = new RecursiveIteratorIterator(new RecursiveArrayIterator($nested_array_x_layers), RecursiveIteratorIterator::SELF_FIRST);
foreach ($iter as $k => $v) {
if (!is_array($v)) {
}
}
But I still want to be able to control which names the arrays have because I need to later use them.
Would that be done using maybe a switch-case and given options for the array names?
But then, how can I control which nesting level belongs to which name?

Answer 1

It is not recommended to use many loops at the same time, by defining keys, combining the arrays first will provide ease of use later.
Table 1
$array_1_data = Array (
[0] => Array ( [id] => 1 [name] => IT [slug] => it )
[1] => Array ( [id] => 2 [name] => Accounting [slug] => accounting )
)
Table 2
$array_2_data = Array (
[0] => Array ( [cid] => 3 [jid] => 24061 )
[1] => Array ( [cid] => 1 [jid] => 24062 )
)
Joining via key
$result = array_uintersect_uassoc($array_1_data, $array_2_data, function($a, $b){
return strcasecmp($a['id'], $b['cid']);
}, function($a, $b){
return (int) [$a, $b] == ['id', 'cid'];
});
conclusion
Array
(
[0] => Array
(
[id] => 1
[name] => IT
[slug] => it
)
)