Array
(
    [0] => Array
        (
            [id] => 5
            [itap] => 1
            [user1] => artem
            [user2] => administrator
        )

    [1] => Array
        (
            [id] => 6
            [itap] => 1
            [user1] => artem
            [user2] => user
        )

    [2] => Array
        (
            [id] => 7
            [itap] => 1
            [user1] => hugo
            [user2] => artem
        )

<?php
 $source = array(
     array
    (
    'id' => 5,
    'itap' => 1,
    'user1' => 'artem',
    'user2' => 'administrator',
    ),array
    (
    'id' => 6,
    'itap' => 1,
    'user1' => 'artem',
    'user2' => 'user',
    ),array
    (
    'id' => 7,
    'itap' => 1,
    'user1' => 'hugo',
    'user2' => 'artem'
    )
 );
$newArray = array();
foreach ($source as $first) {
    foreach ($first as $key => $value) {
        if ($key == 'user1' OR $key == 'user2') {
            array_push($newArray, $value);
        }
    }
}
var_dump($newArray);
?>