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From: Sandman <mr@sandman.net>
Newsgroups: comp.lang.php
Subject: Re: Phone number formatting
Date: Thu, 24 Nov 2011 14:22:37 +0100
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In article <jal3k2$61m$1@dont-email.me>,
 "Álvaro G. Vicario" <alvaro.NOSPAMTHANX@demogracia.com.invalid> 
 wrote:

> El 24/11/2011 8:39, Sandman escribió/wrote:
> >   I have an array with formattings, that looks like this:
> >
> > $formats = array("### ##", "## ## ##", "### ## ##");
> >
> > The phone number above is never more than 7 digits long (as far as I
> > know) in Sweden, so these formats should suffice. Let me explain, in
> > the array, we have formats for 5, 6  and 7 digit phone numbers, set up
> > in a specific way. So this phone number in my example above is 7
> > digits, so it should be formatted as such:
> >
> >      305 19 47
> 
> It's an interesting problem. I've came up with this proof of concept:
> 
> function format_phone_number($number){
> 	$formats = array(
> 		5 => "### ##",
> 		6 => "## ## ##",
> 		7 => "### ## ##"
> 	);
> 
> 	$len = strlen($number);
> 
> 	if( isset($formats[$len]) ){
> 		$format = strtr($formats[$len], array('#' => '%s'));
> 		$digits = str_split($number);
> 		return vsprintf($format, $digits);
> 	}else{
> 		return $number;
> 	}
> }
> 
> Basically, it converts your expression into a printf-compatible format.
> 
> Of course, it'd be easier to use such expression from the beginning:
> 
> function format_phone_number($number){
> 	$formats = array(
> 		5 => "%s%s%s %s%s",
> 		6 => "%s%s %s%s %s%s",
> 		7 => "%s%s%s %s%s %s%s"
> 	);
> 
> 	$len = strlen($number);
> 
> 	if( isset($formats[$len]) ){
> 		$digits = str_split($number);
> 		return vsprintf($formats[$len], $digits);
> 	}else{
> 		return $number;
> 	}
> }
> 
> You could replace %s with %d if you validate that $number is an integer.

Thank you! Your suggestions sparked some ideas that I followed, 
especially the printf-friendly conversion. I also changed the formats 
to include the area code, as such:

    "A-## ## ##"

And replaced it all to

    "%s-%s%s %s%s %s%s"

%s is necessary since %d will strip leading zeroes.


-- 
Sandman[.net]