simple checking and correction of australian and international phone numbers

gistfile1.aw

<?

function checkPhone($int_dial_code, $area_code, $local_number) {
	//try to check and reformat australian numbers
	if ($int_dial_code == "61") {
		//combine the area code and local number
		$full_phone = $area_code.$local_number;
		//strip spaces and hyphens
		$full_phone = str_replace(array(" ", "-"), "", $full_phone);
	
		//australian numbers in the international format:
		//	might start with either 0011, 00, or 0
		//	then might have +
		//	then have 61
		//	then have either 1 to 9, 01 to 09, (0)1 to (0)9, (01) to (09), or -1 to -9
		$aus_int_prefix = "(0011|00|0)?\+?61([1-9]|0[1-9]|\(0\)[1-9]|\(0[1-9]\)|\-[1-9])";
	
		//australian numbers in the domestic format start with either:
		//	start with 01 to 09, (0)1 to (0)9, or (01) to (09)
		$aus_dom_prefix = "(0[1-9]|\(0\)[1-9]|\(0[1-9]\))";

		//numbers in the international format have the international prefix, then 8 digits
		if (preg_match("/^".$aus_int_prefix."([0-9]{8,8})$/", $full_phone, $matches)) {
			//extract the area code from the internationally formatted number
			$val_area_code = "0".$matches[2];
			//extract the local number from the internationally formatted number
			$val_local_number = $matches[3];
	
		//numbers in the domestic format have the domestic prefix, then 8 digits
		} else if (preg_match("/^".$aus_dom_prefix."([0-9]{8,8})$/", $full_phone, $matches)) {
			//extract the area code from the full number
			$val_area_code = $matches[1];
			//extract the local number from the full number
			$val_local_number = $matches[2];
	
		//1300 numbers start with 1300 then have 6 digits
		} else if (preg_match("/^(1300)([0-9]{6,6})$/", $full_phone, $matches)) {
			//set the area code as 1300
			$val_area_code = $matches[1];
			//set the local number as the remaining 6 digits
			$val_local_number = $matches[2];
	
		//1800 numbers start with 1800 then have 6 digits
		} else if (preg_match("/^(1800)([0-9]{6,6})$/", $full_phone, $matches)) {
			//set the area code as 1300
			$val_area_code = $matches[1];
			//set the local number as the remaining 6 digits
			$val_local_number = $matches[2];
	
		//13 numbers start with 13 then have 4 digits
		} else if (preg_match("/^(13)([0-9]{4,4})$/", $full_phone, $matches)) {
			//set the area code as 13
			$val_area_code = $matches[1];
			//set the local number as the remaining 4 digits
			$val_local_number = $matches[2];
	
		//pagers and old analog phone start with 014 to 018 then have 6 digits
		} else if (preg_match("/^(01[45678])([0-9]{6,6})$/", $full_phone, $matches)) {
			//set the area code as the 014 to 018 portion
			$val_area_code = $matches[1];
			//set the local number as the remaining 6 digits
			$val_local_number = $matches[2];
	
		} else {
			throw new Exception("This is not a valid australian phone number\n");
		}
	//try to check non-australian numbers
	} else {
		//combine the area code and local number
		$full_phone = $area_code.$local_number;
	
		//non-australian numbers must contain 5 digits
		if (!preg_match("/^.*[0-9].*[0-9].*[0-9].*[0-9].*[0-9].*$/", $full_phone, $matches)) {
			throw new Exception("This is not a valid non-australian phone number\n");
		}

		//if there is no area code...
		if (strlen($area_code) < 1) {
			//... steal the first digit an use it as area code
			$val_area_code = substr($full_phone, 0, 1);
			$val_local_number = substr($full_phone, 1);

		//no reformatting required
		} else {
			$val_area_code = $area_code;
			$val_local_number = $local_number;
		}
	}

	//return the checked, reformatted number
	return array($val_area_code, $val_local_number);
}

function test() {
	//check that perfect australian numbers are handled correctly
	if (checkPhone("61", "02", "62701234") != array("02", "62701234")) throw New Exception("should have succeded");
	if (checkPhone("61", "1800", "123456") != array("1800", "123456")) throw New Exception("should have succeded");
	if (checkPhone("61", "13", "1234") != array("13", "1234")) throw New Exception("should have succeded");

	//check that imperfect australian numbers are handled correctly
	if (checkPhone("61", "", "0262701234") != array("02", "62701234")) throw New Exception("should have succeded");
	if (checkPhone("61", "18", "00123456") != array("1800", "123456")) throw New Exception("should have succeded");
	if (checkPhone("61", "131", "234") != array("13", "1234")) throw New Exception("should have succeded");

	//check that perfect international numbers are handled correctly
	if (checkPhone("1", "123", "1231234") != array("123", "1231234")) throw New Exception("should have succeded");

	//check that imperfect international numbers are handled correctly
	if (checkPhone("1", "", "1231231234") != array("1", "231231234")) throw New Exception("should have succeded");

	//check that unreadable australian numbers are handled correctly
	try {
		checkPhone("61", "123", "1234");
	} catch (Exception $e) {
		$caught = true;
	}
	if (!$caught) throw New Exception("should have failed");
	unset($caught);

	//check that unreadable australian numbers are handled correctly
	try {
		checkPhone("61", "foo", "bar");
	} catch (Exception $e) {
		$caught = true;
	}
	if (!$caught) throw New Exception("should have failed");
	unset($caught);

	//check that unreadable international numbers are handled correctly
	try {
		checkPhone("61", "", "123");
	} catch (Exception $e) {
		$caught = true;
	}
	if (!$caught) throw New Exception("should have failed");
	unset($caught);
}
?>

If you want to check UK telephone numbers this in PHP may be useful for starters... https://raw.github.com/g1smd/Drupal-CCK-Phone-GB/ea97970a73d3b2ff05cd9fc4a3bac7a43d2fa945/phone.gb.inc