/*
 * Example:
 * 
 *  0049 1136 - 180-0             +49 1136 1800
 *  +49-89-66878-6402             +49 8966 8786 402
 *  0049 2223 34-1325             +49 2223 341325
 *  +49 (0)88 99147687            +49 8899 147687
 */

function phone_number($phone)
{
	$steps = 5;
	
	$phoneBAK = $phone = preg_replace("/[^0-9+]/", '', str_replace(array(' ','(0)'),'', $phone));
	while($phone[0]==0) $phone = substr($phone, 1);
	if(substr($phone, 0, 2)==49) {
		$phone = "+".substr($phone, 0, 2)." ".substr($phone, 2);
		$start = $steps+3;
	}	
	else {
		$phone = $phoneBAK;
		$start = $steps;
	}
	for($i=$start;$i<strlen($phone);$i=$i+$steps) $phone = substr_replace($phone, ' ', $i,0);

	$end = strrchr($phone, ' ');
	if(strlen($end)<4) $phone = substr($phone, 0, 0-strlen($end)) . substr($phone, 0-strlen($end)+1);

	return $phone;
}

Built for german numbers.

Phone Number Beautifier

phone

PHP