如何使用国家/地区代码存储和编辑手机号码？

Question

I've asked once but I didn't get the answers.

 var phoneno = /^\+?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/;

this is how I learnt to validate the numbers + error and... I also have the Mobile bigint(20) & country varchar(200), in my table "users". what I want to do is to use another file "countries.php" to get their codes in mobile input in "signup.php" page and store them both into the database. for example, user chooses 'US +1' the country code will appear in mobile section.

$countryArray = array(
    'AD'=>array('name'=>'ANDORRA','code'=>'376'),
    'AE'=>array('name'=>'UNITED ARAB EMIRATES','code'=>'971'), ...
function countrySelector($defaultCountry = "", $id = "", $name = "", $classes = ""){
    global $countryArray; // Assuming the array is placed above this function

    $output = "<select id='".$id."' name='".$name."' class='". $classes."'>";

    foreach($countryArray as $code => $country){
        $countryName = ucwords(strtolower($country["name"])); // Making it look good
        $output .= "<option value='".$code."' ".(($code==strtoupper($defaultCountry))?"selected":"").">".$code." - ".$countryName." (+".$country["code"].")</option>";
    }

    $output .= "</select>";

    return $output; // or echo $output; to print directly
}

not to mention I downloaded the file zip. and I don't really know how to add or use the " use", please be more specific, like give with examples. thanks