Adding ChatUtil::timeModifier

file/lib/util/ChatUtil.class.php

@@ -11,6 +11,14 @@
  * @subpackage	util
  */
 class ChatUtil {
+	/**
+	 * Matches a time-interval with modifiers.
+	 * Each part may be optionally separated by a comma
+	 * 
+	 * @see	\wcf\util\ChatUtil::timeModifier()
+	 */
+	const TIME_MODIFIER_REGEX = '((?:[0-9]+[h|d|w|m|y|H|D|W|M|Y]?,?)+)';
+	
 	/**
 	 * Creates a gradient out of two colors represented by an integer.
 	 * The first byte is red, the second byte is green, the third one is blue.
@@ -35,5 +43,57 @@ public static function gradient($string, $start, $end) {
 		return $result;
 	}
 	
+	/**
+	 * Creates an interval out of a string with modifiers.
+	 * Modifiers may be mixed. Valid modifiers are: _s_econd, _h_our, _d_ay, _w_week, _m_onth, _y_ear
+	 * '2' -> 2 minutes
+	 * '2h' -> 2 hours
+	 * '1y12m2w3d12h' -> 1 year, 12 months, 2 weeks, 3 days, 12 hours
+	 *
+	 * @param 	string	 	$time
+	 * @return	integer
+	 */
+	public static function timeModifier($time) {
+		preg_match_all('!([0-9]+[s|h|d|w|m|y]?)!i', $time, $matches);
+		$result = 0;
+		foreach ($matches[1] as $time) {
+			// 60 seconds a minute
+			$multiplier = 60;
+			$modifier = substr($time, -1);
 			
+			switch ($modifier) {
+				case 'y':
+				case 'Y':
+					// twelve months a year
+					$multiplier *= 12;
+				case 'm':
+				case 'M':
+					// about 4.3 weeks per month
+					$multiplier *= 4.34812141;
+				case 'w':
+				case 'W':
+					// seven days a weeks
+					$multiplier *= 7;
+				case 'd':
+				case 'D':
+					// 24 hours a day
+					$multiplier *= 24;
+				case 'h':
+				case 'H':
+					// 60 minutes an hour
+					$multiplier *= 60;
+					$time = substr($time, 0, -1);
+				break;
+				case 's':
+				case 'S':
+					// 60 seconds per minute
+					$multiplier /= 60;
+					$time = substr($time, 0, -1);
+			}
+			
+			$result += $time * $multiplier;
+		}
+		
+		return (int) round($result, 0);
+	}
 }