joinFields.php

<?php

class Row {
    public function __construct(array $attributes = [])
    {
        foreach ($attributes as $name => $value) {
            $this->{$name} = $value;
        }
    }
}

class User {
    public function __construct(array $rows = [])
    {
        $this->obj             = $rows[0];
        $this->obj->loc_work   = array_map(function($a) { return $a->loc_work;},   $rows);
        $this->obj->profession = array_map(function($a) { return $a->profession;}, $rows);
        $this->obj->com_name   = array_map(function($a) { return $a->com_name;},   $rows);
        $this->obj->com_inds   = array_map(function($a) { return $a->com_inds;},   $rows);
    }
}
$rows = [
    new Row([
        'id'          => '1',
        'first_name'  => 'Хабиб',
        'last_name'   => 'Макгрэгович',
        'email'       => 'dvoeglazov.ilya@yandex.ru',
        'location'    => 'United States',
        'picture'     => 'https://media.licdn.com/dms/image/C4D03AQF7xeYVfWV...',
        'profile_url' => 'www.linkedin.com/in/%D1%85%D0%B0%D0%B1%D0%B8%D0%B1...',
        'industry'    => 'Information Technology and Services',
        'created'     => '2018-10-04 23:13:00',
        'loc_work'    => 'Saint Petersburg, Russian Federation',
        'profession'  => 'Frontend Engineer',
        'com_name'    => 'Paladin Engineering',
        'com_inds'    => 'Информационные технологии и услуги',
    ]),

    new Row([
        'id'          => '1',
        'first_name'  => 'Хабиб',
        'last_name'   => 'Макгрэгович',
        'email'       => 'dvoeglazov.ilya@yandex.ru',
        'location'    => 'United States',
        'picture'     => 'https://media.licdn.com/dms/image/C4D03AQF7xeYVfWV...',
        'profile_url' => 'www.linkedin.com/in/%D1%85%D0%B0%D0%B1%D0%B8%D0%B1...',
        'industry'    => 'Information Technology and Services',
        'created'     => '2018-10-04 23:13:00',
        'loc_work'    => '',
        'profession'  => 'Капитан команды',
        'com_name'    => 'Яндекс Терра',
        'com_inds'    => 'Нефтяная и энергетическая промышленность',
    ])
];

$user = new User($rows);
echo print_r($user->obj);
?>

Row Object
(
    [id] => 1
    [first_name] => Хабиб
    [last_name] => Макгрэгович
    [email] => dvoeglazov.ilya@yandex.ru
    [location] => United States
    [picture] => https://media.licdn.com/dms/image/C4D03AQF7xeYVfWV...
    [profile_url] => www.linkedin.com/in/%D1%85%D0%B0%D0%B1%D0%B8%D0%B1...
    [industry] => Information Technology and Services
    [created] => 2018-10-04 23:13:00
    [loc_work] => Array
        (
            [0] => Saint Petersburg, Russian Federation
            [1] =>
        )

    [profession] => Array
        (
            [0] => Frontend Engineer
            [1] => Капитан команды
        )

    [com_name] => Array
        (
            [0] => Paladin Engineering
            [1] => Яндекс Терра
        )

    [com_inds] => Array
        (
            [0] => Информационные технологии и услуги
            [1] => Нефтяная и энергетическая промышленность
        )

)