i'm trying to create an array with PHP and MySQL, but i always get errors.

The code i'm using

function db_listar_usuarios(){
$link=db_connect();
$query = "select * from usuarios" or die("Problemas en el select: " . mysqli_error($link));
$result = $link->query($query);
  while($row = mysqli_fetch_assoc($result)) {   
        $row['nombre'] . array(;
        foreach ($row as $col => $val) {
           $col => $val;
        }
    }
}

And what I want to create with this code is:

array(
    'john' => array('address' => 'st 123', 'age' => '25', 'surname' => 'doe'),
    'ane' => array('address' => 'av 456', 'age'=> '32', 'surname' => 'smith'),
);

To use then like something like this:

private $contacts = db_listar_usuarios();

I use 2 files: functions.php and server.php

server.php is a downloaded file example to do a REST API.

Here are both of them.

server.php -> pastebin.com/5j54m1Mz

functions.php -> pastebin.com/N7jMhSBa

Thank you in advance!