Using PHP to format phone numbers

Been out of the game a little while, my apologies. I know there isn’t much I can do to make it up to you (my fans); however, I’ll give you this in hopes of trying to win you back.

Format phone function using PHP:

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function format_phone($country, $phone) {
$function = 'format_phone_' . $country;
if(function_exists($function)) {
return $function($phone);
}
return $phone;
}

function format_phone_us($phone) {
// note: making sure we have something
if(!isset($phone{3})) { return ''; }
// note: strip out everything but numbers
$phone = preg_replace("/[^0-9]/", "", $phone);
$length = strlen($phone);
switch($length) {
case 7:
return preg_replace("/([0-9]{3})([0-9]{4})/", "$1-$2", $phone);
break;
case 10:
return preg_replace("/([0-9]{3})([0-9]{3})([0-9]{4})/", "($1) $2-$3", $phone);
break;
case 11:
return preg_replace("/([0-9{1})([0-9]{3})([0-9]{3})([0-9]{4})/", "$1($2) $3-$4", $phone);
break;
default:
return $phone;
break;
}
}

// usage
$phone = '111 111 1111';
$phone = format_phone('us', $phone);
echo $phone;

You might be wondering why I have 2 functions in there, right? Well, here’s the thing. I like to make things resusable. That being said, I’m leaving the door open to use the same kind of interface, format_phone(‘us’, $phone) or format_phone(‘canada’, $phone), to format other types of phone numbers should the functions exists. I’ll leave those types of implementations as homework.

TODO: update this so that it’s a little bit more users friendly.

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