396-		$customstylevar  = $api->callApi('stylevar', 'get', array($parts[0], $user));
397-		//$customstylevar = vB_Api::instanceInternal('stylevar')->get($parts[0], $user);
398-		return self::outputStyleVar($customstylevar[$parts[0]], $parts);
399-	}
400-
401:	public static function runMaths($str)
402-	{
403-		//this would usually be dangerous, but none of the units make sense
404-		//in a math string anyway.  Note that there is ambiguty between the '%'
405-		//unit and the modulo operator.  We don't allow the latter anyway
406-		//(though we do allow bitwise operations !?)
407-		$units_found = null;
408-		foreach (self::$units AS $unit)
409-		{
410-			if (strpos($str, $unit))
411-			{
412-				$units_found[] = $unit;
413-			}
414-		}
415-
416-		//mixed units.
417-		if (count($units_found) > 1)
418-		{
419-			return "/* ~~cannot perform math on mixed units ~~ found (" .
420-			implode(",", $units_found) . ") in $str */";
421-		}
422-
423-		$str = preg_replace('#([^+\-*=/\(\)\d\^<>&|\.]*)#', '', $str);
424-
425-		if (empty($str))
426-		{
427-			$str = '0';
428-		}
429-		else
430-		{
431-			//hack: if the math string is invalid we can get a php parse error here.
432-			//a bad expression or even a bad variable value (blank instead of a number) can
433-			//cause this to occur.  This fails quietly, but also sets the status code to 500
434-			//(but, due to a bug in php only if display_errors is *off* -- if display errors
435-			//is on, then it will work just fine only $str below will not be set.
436-			//
437-			//This can result is say an almost correct css file being ignored by the browser
438-			//for reasons that aren't clear (and goes away if you turn error reporting on).
439-			//We can check to see if eval hit a parse error and, if so, we'll attempt to
440-			//clear the 500 status (this does more harm then good) and send an error
441-			//to the file.  Since math is mostly used in css, we'll provide error text
442-			//that works best with that.
443-			$status = @eval("\$str = $str;");
444-			if ($status === false)
445-			{
446-				if (!headers_sent())
447-				{
448-					header("HTTP/1.1 200 OK");
449-				}
450-				return "/* Invalid math expression */";
451-			}