sort($mw['countries_name']);
echo '<pre>';
foreach ($mw['countries_name'] as $key => $value) {
    echo ("'".$key."' => '".$value."',<br />");
}
echo '</pre>';

sort($mw['countries_name']);
echo '<pre>';
array_walk_recursive($mw['countries_name'],function($value,$key){echo"'$key' => '$value',\n";});
echo '</pre>';