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<?php

/**
 * Formats UK phone numbers.
 *
 * @param string $phone Phone number to format.
 * @param bool   $skype Whether to create a Skype link or not.
 * 
 * @return string
 */
function format_phone($phone, $skype = FALSE)
{
	// Strip out any existing spaces
	$phone = str_replace(' ', '', $phone);

	// Match 08xx xxx xxx
	if (preg_match('/^08/', $phone))
	{
		$a = substr($phone, 0, 4);
		$b = substr($phone, 4, 3);
		$c = substr($phone, 7, 4);
	}
	// Match 011x xxx xxx
	else if (preg_match('/^011/', $phone))
	{
		$a = substr($phone, 0, 4);
		$b = substr($phone, 4, 3);
		$c = substr($phone, 7, 4);
	}
	// Match 01x1 xxx xxx
	else if (preg_match('/^01.1/', $phone))
	{
		$a = substr($phone, 0, 4);
		$b = substr($phone, 4, 3);
		$c = substr($phone, 7, 4);
	}
	// Match 02x xxxx xxxx
	else if (preg_match('/^02./', $phone))
	{
		$a = substr($phone, 0, 3);
		$b = substr($phone, 3, 4);
		$c = substr($phone, 7, 4);
	}
	// Match 0xxxx xxx xxx
	else
	{
		$a = substr($phone, 0, 5);
		$b = substr($phone, 5, 3);
		$c = substr($phone, 8, 3);
	}

	$phone = $a . ' ' . $b . ' ' . $c;
	
	return $skype
		? '<a href="callto:+44' . str_replace(' ', '', ltrim($phone, 0)) . '" title="Call this number using Skype" class="tooltip skype">' . $phone . '</a>'
		: $phone;
}