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public $users = [
    '1' => [
        'name' => 'Nick',
        'pass' => 'qwer'
    ],
    '2' => [
        'name' => 'Dany',
        'pass' => 'asdf'
    ]
];

public function array_insert($users)
    {
        $users[] = '3';
        $users[3] = ['name' => 'Alek', 'pass' => 'zxcv'];

        array_push($users, array('3' => ['name' => 'Alek', 'pass' => 'zxcv']));

        $nusers = [
            '3' => [
                'name' => 'Alek',
                'pass' => 'zxcv'
            ]
        ];

        array_merge($users, $nusers);
    }

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <?php
        include 'Collections.php';
        $col = new Collections;
        $col->show($col->users);
        $col->array_insert($col-users);
        $col->show($col->users);
        ?>
    </body>
</html>

function insert($user = [])
{

    $users['name'] = $user[0];
    $users['pass'] = $user[1];
    return $users;
}

$users = [
    '1' => [
        'name' => 'Nick',
        'pass' => 'qwer'
    ],
    '2' => [
        'name' => 'Dany',
        'pass' => 'asdf'
        ]
    ];

$users[] = insert(['Alex','das']);

public static $users = [
    '1' => [
        'name' => 'Nick',
        'pass' => 'qwer'
    ],
    '2' => [
        'name' => 'Dany',
        'pass' => 'asdf'
    ]
];

public function extend_array(){

    array_push(self::$users, ['name' => 'Alek', 'pass' => 'zxcv']);
    print_r(self::$users);

}