Group rows of a 2d array and restructure as a multidimensional array

I have an array like this

[
    1 => [
        'name'             => 123,
        'id'               => 105740727,
        'email'            => 'fghfhfh',
        'phrases_relevant' => 123,
        'searches_id'      => 105740727,
    ],
    2 => [
        'name'             => 'porshe',
        'id'               => 105713889,
        'email'            => 'fghfghf',
        'phrases_relevant' => 'porshe',
        'searches_id'      => 105713889,
    ],
    3 => [
        'name'             => 'porshe',
        'id'               => 105713889,
        'email'            => 'fghfghf',
        'phrases_relevant' => 'merce',
        'searches_id'      => 105713889,
    ],
]

I need group this group via value. Output array should looks like below. dimension second and third has same searches_id

  [0] => Array
    (
        [email] => fghfghf
        [projects]=>
              [porshe] => [porshe, merce]
  [1] => ...

My code:

foreach ($results as $key => $result) {
     $testArray[]['projects'][$result['name']][] = $result['phrases_relevant'];

but this insert one phrases.

You need to sort first by searches_id then apply loop,

function sortByOrder($a, $b)
{
    return $a['searches_id'] - $b['searches_id'];
}
usort($myArray, 'sortByOrder');
foreach ($myArray as $key => $value) {
    $result[$value['searches_id']]['email']      = $value['email'];
    $result[$value['searches_id']]['projects'][] = $value['phrases_relevant'];
}
$result = array_values($result); // reset keys used for array generation

Working demo.