如何基于键合并嵌套数组？

Question

I have array as shown on picture above, I am trying to merge all the nested arrays based on keys, so for example right now there are 5 arrays with key 34. I want one array with 34 key and 5 values. How can I achieve that? Here is my code.

    $proba = array();
while($row = $result->fetch(PDO::FETCH_ASSOC)){
    extract($row);
    if(!in_array($id, array_column($posts_arr['lokacije'], 'id'))) {
        $post_item = array(
            'id' => $id,
            'name' => $name,
            'state' => $state,
            'address' => $address,
            'phone' => $phone,
            'working_hours' => $working_hours,
            'description' => $description,
            'email' => $email,
            'fb_page' => $fb_page,
            'website' => $website,
            'additional_info' => $additional_info,
            'lat' => $lat,
            'lng' => $lng
        );
    array_push($posts_arr['lokacije'], $post_item);
    };

    array_push($proba, array($id => $naziv));
    $test = array_merge_recursive($proba, array($id => $naziv));
}
print_r($test);

Answer 1

$proba = array();
while($row = $result->fetch(PDO::FETCH_ASSOC)){
    extract($row);

    //....

    if (empty($proba[$id])) {
        $proba[$id] = array();
    }
     $proba[$id][] = $naziv;
}

Also I don't understand why you use extract - I suppose, $post_item is the same as $row .

Answer 2

I created a demo just like yours, here is the code:

$arr = [
    [2 => 'A'],
    [34 => 'B'],
    [34 => 'C'],
    [34 => 'D'],
    [34 => 'E'],
    [34 => 'F'],
    [20 => 'G'],
];

$result = [];

foreach($arr as $a) {
    foreach($a as $key => $value) {
        array_key_exists($key, $result) ?
            $result[$key][] = $value:
            $result[$key] = [$value];
    }
}

The result is:

array(3) {
  [2]=>
  array(1) {
    [0]=>
    string(1) "A"
  }
  [34]=>
  array(5) {
    [0]=>
    string(1) "B"
    [1]=>
    string(1) "C"
    [2]=>
    string(1) "D"
    [3]=>
    string(1) "E"
    [4]=>
    string(1) "F"
  }
  [20]=>
  array(1) {
    [0]=>
    string(1) "G"
  }
}

Answer 3

The simple answer to what I understand you're trying to do:

foreach($input as $nr=>$data) {
    foreach($data as $key=>$val) {
        $output[$key][$nr] = $val;
    }
}

This will simply flip the hierarchy levels. If you just want to collect values, this is one way to do it. It keeps the original array indexes, but instead of "[$nr]" you can just say "[]" to make it a simple sequential array.

If you present your array as text instead of that big image there, I'll show you the results.